I really appreciate you leaving links to the results and following videos. I hate when TH-camrs don’t,so I just block their content or dislike. Thanks bro
You have to get a certain concentrated peroxide, like those in hair salons that is far more than 3 %, and then it needs to be submerged in it, in a tub, under UV lights, sealed up. Seal it because UV lights can harm your eyes and prolonged exposure can hurt your skin. This is how a lot of electronics restorers fix old faded plastic casings.
Developers but that should Be used when necessary windex (ammonia based window cleaners) usually removes most yellowing on things so if you can windex should be tried before going as extreme as developer.
That works exclusively on ABS plastic. This lampshade cannot be ABS, because ABS doesn't come out clear, it's milky and just barely translucent without additives. Heat and some sunlight is already effective. If peroxide developer is going to work, then 3% peroxide would already have a pretty substantial effect, peroxide developer is just quicker. I suggest that the plastic was likely PET, PC or PMMA which don't yellow by the same mechanism as ABS and don't restore this way. The yellowing is due to breakdown and there is no known way to fix it. The best course of action is making new lampshades. You can even copy the existing ones to retain their design with vacuum thermoforming or mould slosh casting.
The high percentage hydrogen peroxide paste used for hair bleaching is what I used to make my NES and old light switch covers like new. Give that a try!
The nes doesn't have transparent plastic. It only gets yellow on the surface. Transparent plastics get yellow on the inside where the chemicals can't reach.
@@nikkopt The yellow is usually only on the surface as that's where the oxygen is, the ultra violet light catalyzes the oxide reaction in some plastics.
@@thelazarous I don't know the science behind it but i've cut several kinds of transparent yellowed plastics (lots of transparent phone cases) to see the cross section and they are also yellow inside.
@@nikkopt Wonder if they're silicon based, were they somewhat flexible? Not like bend it half flexible but rather springy. I know silicone will basically turn to ash inside and out if exposed to ultra violet light for long enough.
@@thelazarous not sure. Had an ipod cover that was very soft an rubbery. That one def got weaker as it yellowed and started to get tears. The phone cases I'm not sure. They are harder but not hard plastic. Had some that were stored for a couple of years and still got yellow in the dark.
Also, with hydrogen peroxide, the reason why it’s stored in a dark bottle like that is so it doesn’t oxidize. Once hydrogen peroxide is exposed to air, it just becomes water.
The dark bottle is to block out light. The O-O single bond in hydrogen peroxide is not very stable, and light can give it enough energy to break apart, forming water and oxygen gas
Use salon care 40 and wrap with clear Saran wrap leave in the Sun or ultraviolet light for several hours It's similar to the process of the yellowing sneakers if you want to look that up
The yellowing in plastic systems is usually caused by the plasticizers (additives to help melt viscosity and softness, which often contain aromatic rings) undergoing radical reactions caused by exposure to UV light over long periods of time. Not something that can easily be extracted with any aqueous wash.
I watch these out of order because I didn't find them in my feed quick enough you have to say what a good little experiment I was really shocked that nothing worked all that well I know for headlights my friend uses lemon juice and baking soda and she just cuts the lemon in half and then scrubs baking soda
I found my mom‘s 25-year-old bread machine in the back of a walk-in closet and the metal parts were still white, but the plastic lid had turned an ugly dark yellow so I went to Sally’s beauty supply and bought a bottle of hair bleach, the thick white pasty stuff and a cheap applicator brush. I painted the lid with a thick coating of that, put it in a clear big plastic bag and set it out in the Florida sun for several hours, brought it in and cleaned it off and it had whitened considerably so I repeated the process for two more days, letting it sit in the sun for about 6 to 8 hours a day and it worked. The lid was a slightly different shade of white than the metal body, I knew I wouldn’t get an exact match because obviously plastic and metal paint are going to age differently but it is hardly noticeable. I use it on the dough cycle when making bread now instead of my stand mixer.
Use 60% peroxide cream/liquid from a hair salon and wrap the lantern thing in Saran Wrap after coated leave it under the sun or uv lights for 24 hours and it will be like brand new after it’s washed.
Glass is best. I have run into the same problem. I’m in this home 20 years. I replaced the builders 4 lamps after 3 years (they were tinny brass and were starting to corrode). I replaced with aluminum (my old home had them, 14 years old still like new) and they lasted about 16 years, but paint was not real good. It was actually cheaper to buy new than spend the time to repaint. The entry light was in a covered entry area on the ceiling, this I painted and did not replace. I’m seeing that the new fixtures look ok after 2 years, but the paint isn’t as good as the previous. My old home, the fixtures are now over 32 years old, have been repainted white and are still there! The original paint was epoxy based, next time I will repaint with epoxy based black. Well life goes on, good luck. Jim
There’s a great product called Dip-It. It’s a stain remover and it works wonders. We use it in kitchens all the time to remove coffee stains from the insides of coffee carafes.
Did you cover the container of peroxide? It has to be sealed and for deep yell can take multiple baths. But I use the stuff for bleaching hair. Cover it like you are painting it then cover it with plastic wrap. Leave in hot sun till clear again.
OxiClean+UV lights will whiten yellowed white plastic, though I've never tried it with clear plastic. Might be worth a try, if you ever revisit the idea.
Use one of them kits for cleaning up head lights it works grate!!! And yes there is some sanding involved but you can use a power tool works grate tho I did it to my doorbell camera out front for the lense
I’ve seen a restoration guy here on TH-cam that uses some solution and uses uv light and his old faded white plastics come out freakin amazing. The channel escapes me but I’m sure a smart guy like you can find him. I believe he restore very old tonka trucks and toys of that nature. 🤷🏽♂️
On another channel I have seen a guy use something called "retro-bright" but he is applying it to the opaque plastic parts that computer cases are made out of. I have no idea what success you might have on clear plastics. But it might be worth looking into. It is a product that you submerge the object in and then leave in broad sunlight for several hours. So if might be like what you tried already.
one thing i didnt see in that bundle, while there was a headlight kit there, but there is another kind that is more like wax where you wipe it on, rub it in , let it sit a bit and wipe it off, blue diamond makes it and i think miguire makes it too, both work very well on headlights, headlights that were made in 1996 and had never been treated, just saying it might prove better results as the stuff had a chemical smell to it i didnt recognize amongst all the things ive tried before on the headlights trying to obtain similar results that might be the key to lifting the yellow out of the plastic and restoring the clarity
Me aswell always loved to question it how does it do that then when you do science experiments it’s always satisfying to me to figure it out thanks for sharing ❣️🤗🫶🏼
Peroxide cream can work, but it's possible it can streak as well. A high % liquid is better option to prevent streaking. Tons of videos on it within the retro computer / console repair community
I used a similar method to the water and baking soda to get yellowing off the bottom of shoes except I used hydrogen peroxide instead of water. There’s also a shampoo that would be used with a similar effect, I think it’s called salon40 or something like that.
Clorox clean up spray. I don’t know what’s in it, but spray them. Let sit a few and then use micro rag. I just thought about using dishwasher soap. I would use to whiten & clear up.
A popular way to remove yellowing on plastic/clear outsoles of shoes is to brush them with salon care 40, put plastic wrap to prevent it from drying out, and then put it in the sun/in a box under uv light.
Make a solution of water and vinegar using 1 tablespoon vinegar per 1 cup of water. Pour into the container and let the solution sit for 1 to 2 hours. Wipe clean, rinse, and dry.
the simple thing to do is just go to your local glass store and replace the plastic with glass and all weather caulk, the shop can cut the glass to the desired size and then all you need to do is use the caulk to hold the glass in to place, it shouldn't take more than 2 days one day to get the glass cut to size, if that, and the other putting the caulk around the inside of the lamp to hold the pieces of glass in place and let it dry, then just re install the cover and there you go.
Lemon juice and salt. Rub in like a paste. Let it sit a few hours. Take a toothbrush and scrub it in again. See where you are. Then repeat. Lemon juice works for yellowing.
do the baking soda rub but then spray a little lemon water all over it... would work best if you made the lemon water. boil water. add halved lemons. turn heat off and let sit overnight.
1)Toothpaste brush it in then soak it in vinegar then wash it off 2)use baking soda and vinegar be careful of mess 3)use lemon and baking soda rub it in then soak it in vinegar
retro computer restorers use a product called retrobrite (sp) to remove the yellowing of old computer cases, might work or maybe figure out what's actually in it.
I don't think anything will happen. My guess is the discolorment is the plastic itself being discolored from absorbing uv rays. No stains or definitely not surface level. I'd say replace it with glass or plastic that is fully covered with a uv protective layer.
If you added lemon and the baking soda to the jar and place plastic in it for a while and after 2 hours rub the baking soda WITH hand on to lantern then soaked overnight.
Some plastics like older acryilic's can't have yellowing reversed, the only way is to replace, its a more commonly known thing on vintage watch repair for instance, in severe cases the acrylic breaking down off gasses a corrosive element and it begins to corrode delicate parts like the hands, face and movement parts, so best to replace or you will have a much more extensive repair down the line due to corrosion.
Sodium Thiosulfate, is used for removing chlorine from water. It can be found as crystals to add to bath tubs of water, or even certain shampoos. It could likely remove the Bromine yellowing in most plastic items.
Use the same method as for yellow headlights... put acetone in an empty redbull can with a rubber tube at opening and seal tube around the opening ... then heat it w heat gun... Point fumes coming oit of tube onto the plastic... The heated fumes should restore the plastic... btw all the yellow should be wet sanded out... Also use safety precautions and PPE cause of flammables etc. Also spray a clear coat over it when done
Hydrogen peroxide would work quite well if not so dilute. Try the peroxide hair cream. Cover in plastic so it doesn't dry. Works wonders on restoring the color on those old Nintendo systems.
Try volume 40 conditioner it works on shoe soles. Gotta wrap it in saran wrap and either put it out on the sun or uv light for 2 hours at a time it dries out so gotta do it a few times depending on how yellow the material is. But give it a try
Part 1: The experiment
th-cam.com/users/shortsFp_gnlssvfs
Part 3: A solution to make custom glass inserts
th-cam.com/users/shortsv6PrJ3HOdac
Spray oven cleaner over them cover up wait an hour and scrub them should come up clean I use this for headlights
Try stronger, hydrogen peroxide, like lab grade
Where’s part 3? I can’t wait. I gotta have it now! 😂😂😂
hey what's the background music name?
@@Mathew-vlogs , he'll edit this pinned comment when he releases part 3.
wow - someone actually doing a follow-up, not just saying they‘ll do one.
Are you sure?... This short was 3mnths ago and i haven't seen part 3 or what helped to make these clean again
@@jouliesoulie he literally pinned a comment with the links to both part 1 and 3 lol
@@jouliesoulie someone blind
@@atefxf Oh ok, sorry i didn't know that...
You needed hair bleach love
I really appreciate you leaving links to the results and following videos. I hate when TH-camrs don’t,so I just block their content or dislike. Thanks bro
You have to get a certain concentrated peroxide, like those in hair salons that is far more than 3 %, and then it needs to be submerged in it, in a tub, under UV lights, sealed up. Seal it because UV lights can harm your eyes and prolonged exposure can hurt your skin.
This is how a lot of electronics restorers fix old faded plastic casings.
I agree, some use mix of 30% hydrogen peroxide and leave It inside close box for 24h with UV light or more
Retro bright is what the process has been named although it might not work on the type of plastic in the lanterns
The 3% worked decent on the side that had sun exposure. I doubt he needs more than 9% H2O2.
Developers but that should Be used when necessary windex (ammonia based window cleaners) usually removes most yellowing on things so if you can windex should be tried before going as extreme as developer.
That works exclusively on ABS plastic. This lampshade cannot be ABS, because ABS doesn't come out clear, it's milky and just barely translucent without additives.
Heat and some sunlight is already effective. If peroxide developer is going to work, then 3% peroxide would already have a pretty substantial effect, peroxide developer is just quicker.
I suggest that the plastic was likely PET, PC or PMMA which don't yellow by the same mechanism as ABS and don't restore this way. The yellowing is due to breakdown and there is no known way to fix it. The best course of action is making new lampshades. You can even copy the existing ones to retain their design with vacuum thermoforming or mould slosh casting.
I have seen a blow torch restore the finish on plastics. It's very tricky and precise, but is incredible to watch when it's done correctly.
The high percentage hydrogen peroxide paste used for hair bleaching is what I used to make my NES and old light switch covers like new. Give that a try!
The nes doesn't have transparent plastic. It only gets yellow on the surface. Transparent plastics get yellow on the inside where the chemicals can't reach.
@@nikkopt The yellow is usually only on the surface as that's where the oxygen is, the ultra violet light catalyzes the oxide reaction in some plastics.
@@thelazarous I don't know the science behind it but i've cut several kinds of transparent yellowed plastics (lots of transparent phone cases) to see the cross section and they are also yellow inside.
@@nikkopt Wonder if they're silicon based, were they somewhat flexible? Not like bend it half flexible but rather springy. I know silicone will basically turn to ash inside and out if exposed to ultra violet light for long enough.
@@thelazarous not sure. Had an ipod cover that was very soft an rubbery. That one def got weaker as it yellowed and started to get tears. The phone cases I'm not sure. They are harder but not hard plastic. Had some that were stored for a couple of years and still got yellow in the dark.
Also, with hydrogen peroxide, the reason why it’s stored in a dark bottle like that is so it doesn’t oxidize. Once hydrogen peroxide is exposed to air, it just becomes water.
The dark bottle is to block out light. The O-O single bond in hydrogen peroxide is not very stable, and light can give it enough energy to break apart, forming water and oxygen gas
Might be my first part 2 of a short. 😢 After so many years on this rock..thank you
I’m strangely invested in this story.
"and it was all yellow" 💀
Bug spray works well. You'll want to clear coat the lenses afterwards, or they will yellow again after a few weeks. I recommend spraymax
I came to say bug repellant also
with H2O2, you’re supposed to cover it with seran wrap or something clear and airtight. the gasses are just as important as the liquid.
And you are supposed to use a higher percentage
@@basedmale4719 Yes, as well as maintain the Ozone atmosphere while it's being exposed to UV.
Um no.
@@jadedvintage1 I'm pretty sure you haven't seen it yourself. Especially how the results look.
Nooooo...another cliff hanger! What WILL happen next?
I've got to see part 3!
Use salon care 40 and wrap with clear Saran wrap leave in the Sun or ultraviolet light for several hours
It's similar to the process of the yellowing sneakers if you want to look that up
I was going to say the same thing
You woke up still wearing your sun hat 😂
Deep woods off mosquito repellent works on yellowish headlights. I didn’t believe it until I tried it.
Most amazing thing is that the one outside in the sun made it's way indoors all by itself!
The yellowing in plastic systems is usually caused by the plasticizers (additives to help melt viscosity and softness, which often contain aromatic rings) undergoing radical reactions caused by exposure to UV light over long periods of time. Not something that can easily be extracted with any aqueous wash.
(the sound of all the materials chemists in the chat groaning over these experiments)
I watch these out of order because I didn't find them in my feed quick enough you have to say what a good little experiment I was really shocked that nothing worked all that well I know for headlights my friend uses lemon juice and baking soda and she just cuts the lemon in half and then scrubs baking soda
Finally, A TH-camr that links Parts 1,2 and 3.
A common problem with the plain old blog as well. You'd think there could be a way to automatically generate the links by now.
Part 3?
THANKYOU for linking pt.2
Try retrobrite, the DIY formula you use to make old electronics white. Attacks specifically the browning caused by brominated flame retardants.
that won't work since the plastic has been physically changed
I appreciate u sm u put part 2 in the comments
There’s no way the headlight restoration kit didn’t work.
Exactly. He either did it wrong or didn't do it at all
Thankyou for linking the second part
See there’s frugality but then there’s your dad spending more money trying to fix the damn thing than it’s worth because he’s STUBBORN 😂
I found my mom‘s 25-year-old bread machine in the back of a walk-in closet and the metal parts were still white, but the plastic lid had turned an ugly dark yellow so I went to Sally’s beauty supply and bought a bottle of hair bleach, the thick white pasty stuff and a cheap applicator brush. I painted the lid with a thick coating of that, put it in a clear big plastic bag and set it out in the Florida sun for several hours, brought it in and cleaned it off and it had whitened considerably so I repeated the process for two more days, letting it sit in the sun for about 6 to 8 hours a day and it worked. The lid was a slightly different shade of white than the metal body, I knew I wouldn’t get an exact match because obviously plastic and metal paint are going to age differently but it is hardly noticeable. I use it on the dough cycle when making bread now instead of my stand mixer.
Try transmission fluid I've used it on yellowed headlights it's always worked for me. That or good old WD-40
Use 60% peroxide cream/liquid from a hair salon and wrap the lantern thing in Saran Wrap after coated leave it under the sun or uv lights for 24 hours and it will be like brand new after it’s washed.
Oh hell naw, not the marble stripes
@@miniak2708 What? 💀
Part 3 please it's been an eternity! 🤷🏻♂️
I am wondering why a headlight kit didn’t work for you! It worked so well on my cars headlights and they’re polycarbonate too.
Glass is best. I have run into the same problem. I’m in this home 20 years. I replaced the builders 4 lamps after 3 years (they were tinny brass and were starting to corrode). I replaced with aluminum (my old home had them, 14 years old still like new) and they lasted about 16 years, but paint was not real good. It was actually cheaper to buy new than spend the time to repaint. The entry light was in a covered entry area on the ceiling, this I painted and did not replace. I’m seeing that the new fixtures look ok after 2 years, but the paint isn’t as good as the previous. My old home, the fixtures are now over 32 years old, have been repainted white and are still there! The original paint was epoxy based, next time I will repaint with epoxy based black. Well life goes on, good luck. Jim
Tooth paste. Works wonders. Makeup remover, baby wipes. Idk why but always dud great on stains
that's not a surface stain, the plastic has been physically altered at the molecular level
There’s a great product called Dip-It. It’s a stain remover and it works wonders. We use it in kitchens all the time to remove coffee stains from the insides of coffee carafes.
Is the third part coming any time soon?
its in the pinned comment
@@kilzo_ where
@@finnafishfl th-cam.com/users/shortsFp_gnlssvfs?feature=share
I dont know about light covers but this is usually for getting the yellow out of plastics that were in an environment where people smoked.
Yes! Finally a YT creator that actually posts the link to next part. Subscribed!
No link to part 3 tho
@@JackDaniels-ex9mf its in the pinned comment
Did you cover the container of peroxide? It has to be sealed and for deep yell can take multiple baths.
But I use the stuff for bleaching hair. Cover it like you are painting it then cover it with plastic wrap. Leave in hot sun till clear again.
I'm sure blinker fluid would work
off deep woods bug spray works like a dream for car headlights
Brasso works great, brings old plastic to like new condition, use it all the time when restoring cars, just need some elbow grease
Their is this one soap my shop teacher uses where we use to clean our headlights and works pretty good
Yep, unfortunately most kind of plastic yellowing cannot be repaired. Thanks for the video :)
This is like that one dude who tried to do all this for his clear phone case.
Great! You discovered crowd sourcing.
Baking soda is awesome to use indeed, will try this even on my car headlamps glass
OxiClean+UV lights will whiten yellowed white plastic, though I've never tried it with clear plastic. Might be worth a try, if you ever revisit the idea.
For the hydrogen peroxide you need to use a way higher concentration, you need the salon strength stuff and that works pretty well
Some kid at a gas station did my headlights for $10. I don't know what he used, but it was nontoxic (proved by him drinking it), and it worked great.
I DID ENJOY YOUR PRESENTATION JUST THE SAME AT 70 👁 STILL ENJOY LEARNING
(PERIOD)
Bug repellent spray , it also works on headlights on vehicles. Spray and clean off with a cloth.
White vinegar and bicarb soda. Paste it on and give a little scrub with the green part of a sponge
Use one of them kits for cleaning up head lights it works grate!!! And yes there is some sanding involved but you can use a power tool works grate tho I did it to my doorbell camera out front for the lense
The mix I know it works, although not sure if it does in this kind of material, it's baking soda mixed with vinegar no water
Use "blending solvent" for autobody clear coat blending that's used to hide spot repairs, it will work!
I’ve seen a restoration guy here on TH-cam that uses some solution and uses uv light and his old faded white plastics come out freakin amazing. The channel escapes me but I’m sure a smart guy like you can find him. I believe he restore very old tonka trucks and toys of that nature. 🤷🏽♂️
On another channel I have seen a guy use something called "retro-bright" but he is applying it to the opaque plastic parts that computer cases are made out of. I have no idea what success you might have on clear plastics. But it might be worth looking into. It is a product that you submerge the object in and then leave in broad sunlight for several hours. So if might be like what you tried already.
Should've tried scrubbing the baking soda light shade with some of the peroxide with half a lemon
one thing i didnt see in that bundle, while there was a headlight kit there, but there is another kind that is more like wax where you wipe it on, rub it in , let it sit a bit and wipe it off, blue diamond makes it and i think miguire makes it too, both work very well on headlights, headlights that were made in 1996 and had never been treated, just saying it might prove better results as the stuff had a chemical smell to it i didnt recognize amongst all the things ive tried before on the headlights trying to obtain similar results that might be the key to lifting the yellow out of the plastic and restoring the clarity
note it may take 2-3 times to obtain the clarity desired
Peroxide weakens when exposed to light. Thats why it is packaged the way it is. How is exposing it to sunlight useful?
Mix the peroxide with the baking soda or with the vinegar.
Me aswell always loved to question it how does it do that then when you do science experiments it’s always satisfying to me to figure it out thanks for sharing ❣️🤗🫶🏼
Peroxide cream can work, but it's possible it can streak as well. A high % liquid is better option to prevent streaking. Tons of videos on it within the retro computer / console repair community
The yellowing is oxidation, you can use a car polish or scratch "remover" to remove it, this also works on headlight assemblies.
I used a similar method to the water and baking soda to get yellowing off the bottom of shoes except I used hydrogen peroxide instead of water. There’s also a shampoo that would be used with a similar effect, I think it’s called salon40 or something like that.
I wonder if the shaving cream hack would work here like on car headlight cases or if a baking soda, dawn, and vinegar mix would work?
CLR. It’s a product. Kind of magic and perfect for this problem.
Bro was sleeping with the cap on 💀
Clorox clean up spray. I don’t know what’s in it, but spray them. Let sit a few and then use micro rag. I just thought about using dishwasher soap. I would use to whiten & clear up.
A popular way to remove yellowing on plastic/clear outsoles of shoes is to brush them with salon care 40, put plastic wrap to prevent it from drying out, and then put it in the sun/in a box under uv light.
40 volume creme developer. Put on a thick layer, Leave it in direct sunlight all day. Reapply every couple hours.
Uv with peroxide is probably the only way look up electronic restoration videos
Knowing how well Baking Soda & Vinegar mixed into a paste cleaned my mattress; I think I’d try that combo.
Make a solution of water and vinegar using 1 tablespoon vinegar per 1 cup of water. Pour into the container and let the solution sit for 1 to 2 hours. Wipe clean, rinse, and dry.
Have you tried letting it sit in Lime-a-way, worked for the clear plastic lamp covers I had in my car
If you use the hydrogen peroxide and UV light method wrap the bucket in aluminum foil to make sure the uv gets concentrated
the simple thing to do is just go to your local glass store and replace the plastic with glass and all weather caulk, the shop can cut the glass to the desired size and then all you need to do is use the caulk to hold the glass in to place, it shouldn't take more than 2 days one day to get the glass cut to size, if that, and the other putting the caulk around the inside of the lamp to hold the pieces of glass in place and let it dry, then just re install the cover and there you go.
Lemon juice and salt. Rub in like a paste. Let it sit a few hours. Take a toothbrush and scrub it in again. See where you are. Then repeat. Lemon juice works for yellowing.
do the baking soda rub but then spray a little lemon water all over it... would work best if you made the lemon water. boil water. add halved lemons. turn heat off and let sit overnight.
Cant wait for part 3
The yellowing is because of ultraviolet light in the first place, so using it would just make the problem worse.
Have you tried spraying the lantern shroud with some clear paint??! 😅😅
1)Toothpaste brush it in then soak it in vinegar then wash it off
2)use baking soda and vinegar be careful of mess
3)use lemon and baking soda rub it in then soak it in vinegar
Try off spray. The one with deet. Works on my cars headlights, might work here too.
I had seen something once about using aerosol hairspray on yellowing headlight covers.
retro computer restorers use a product called retrobrite (sp) to remove the yellowing of old computer cases, might work or maybe figure out what's actually in it.
I don't think anything will happen. My guess is the discolorment is the plastic itself being discolored from absorbing uv rays. No stains or definitely not surface level. I'd say replace it with glass or plastic that is fully covered with a uv protective layer.
If you added lemon and the baking soda to the jar and place plastic in it for a while and after 2 hours rub the baking soda WITH hand on to lantern then soaked overnight.
Some plastics like older acryilic's can't have yellowing reversed, the only way is to replace, its a more commonly known thing on vintage watch repair for instance, in severe cases the acrylic breaking down off gasses a corrosive element and it begins to corrode delicate parts like the hands, face and movement parts, so best to replace or you will have a much more extensive repair down the line due to corrosion.
The headlight restoration kit will most definitely work👍
A old lady at my job use to use The Smokers Denture cleaner tablets in warm water and let them sit in it over night
I know you've moved on by now, but thank you for the pinned comments for anyone trying to find this or the first one
Did you try both the vinegar and baking soda with hot water a .5 teaspoon of dish detergent?
Can you use heat like a blowtorch/heat gun...similar to refreshing stadium seating 🤔
Sodium Thiosulfate, is used for removing chlorine from water. It can be found as crystals to add to bath tubs of water, or even certain shampoos. It could likely remove the Bromine yellowing in most plastic items.
Only from opaque plastics, unfortunately. It only works on the surface.
In transparent plastics the yellow is all the way through and can't be fixed.
Use the same method as for yellow headlights... put acetone in an empty redbull can with a rubber tube at opening and seal tube around the opening ... then heat it w heat gun...
Point fumes coming oit of tube onto the plastic...
The heated fumes should restore the plastic... btw all the yellow should be wet sanded out...
Also use safety precautions and PPE cause of flammables etc.
Also spray a clear coat over it when done
Needed the UV lights on the peroxide, the sun would take several days to do the work but a UV lamp should work in one or two
Hydrogen peroxide would work quite well if not so dilute. Try the peroxide hair cream. Cover in plastic so it doesn't dry. Works wonders on restoring the color on those old Nintendo systems.
Try volume 40 conditioner it works on shoe soles. Gotta wrap it in saran wrap and either put it out on the sun or uv light for 2 hours at a time it dries out so gotta do it a few times depending on how yellow the material is. But give it a try