Awesome to see a contractor that is so open and honest about the process and equipment they use. I’ve called someone do do my grout and I wouldn’t have without knowing exactly what’s involved and how incapable I am of doing it.
@@Hallahanify okay so I just gotta rent a buffer and research chemicals. Sounds about as easy as any other trade specific diy project. I doubt it would be much more affordable considering.
it was great of you to feature matts business, He is as good as the best in grout cleaning.AND HIS MACHINES ARE TOP OF THE LINE. fantastic video. ive been doing stone restortion ,all stone surfaces since 1988 over 31 years and counting. Marble Miracles Tampa Bay area,florida
I’ve been in the business for 16 years and I do have different techniques then him. I agree with most of what he says in the video. In my business we do it all by hand and color seal the grout a color the customer wants. Most of the time matching the color of tile and grout. I would like to reach out to him to see how he likes those machines. I’m here in Florida so no competition towards him. Great video don’t be embarrassed out your floors. They are all that way in the cleanest houses.
We do color seal at times also depending on the condition of the floor. If there is a bunch of staining in the grout, this is the best way to make an old floor look basically brand new or close to it.
WoW Wee Whoa. Nice work Matt and Isaac! I met Matt at a trade show a few years back, definitely knows his stuff. Not just with tile and grout, but granite, marble, and polishing shower glass as well.
Hi Mike! Thanks for the endorsement! Mike really knows how to restore tile and grout, natural stone and shower glass. If you're in Poulsbo, Washington or surrounding areas give him a call. Northwest Tile and Stone Care.
Yeah when he flipped it over I was like "Oh shit that's a pressure washer." I have the same thing like that for outside. Minus the wet vac hose of course.
This was very helpful, thank you. We're having our kitchen remodeled and after they're done I'm going to have my kitchen professionally cleaned. the on knees thing just isn't cutting it. You sound like me, I always feel I need to clean my house before the cleaning lady comes!
Went into a house to redo tub grout & caulk. The grout on the tile throughout the house(had all tile floors) was black. After redoing bathroom, showed homeowner that their grout is supposed to actually be a beige/tan color AND NOT black.....it was that DIRTY! with no sealer/sealant etc... Ended up cleaning it & sealed it & now looks beautiful (just need to remember that a sealer isn’t going to last forever.....will need to be reapplied every once in awhile to keep the grout sealed (water resistant)). L8R ✌🏻
He's basically using a whirlybird sidewalk cleaning pressure washer attachment, but with a vacuum port on it. When I pressure cleaned sidewalks or decks at my properties, I would rent those large pressure machines, with the Honda engine, and the whirlybird attachments with the pressure washer to do the sidewalks, but they don't have the vacuum attachments on them. Also we've used Stanley Steemer, who does similar to the carpet with their machine on grout as well, and it worked pretty good in one of my townhouse projects. They usually up-sell you when they are doing the carpets, they notice the tile and tell you about cleaning the tile and grout, so we haggle down the price.
Do you haggle the waiter at a high end steakhouse and tell them the price is too much or do you pay the price cause you know your getting a quality steak? These guys have money invested in there business know there stuff , they have been trained and your going to tell them what they should charge to break there back.🤯🤯 smh!
I just realized that's the {damn near, except the vacuum part of it} design for the pressure washer surface cleaner! Genius. Yet I should've came up with this idea. 😤
Awesome. I do more of manual and it is very difficult and inflict injuries to my hands when i really want to give my best.I would like to to know more and how to aquire the basics. I'm in Nigeria, West Africa.
A before and after photo would be nice. I have been using a hoover floormate to clean and vacuum dirty water off of my tile floors. I would use that over damp mopping anyday.
Is that the all in one vacuum/mop? Who ever invented that needs to be punched in the throat. Something about vacuuming pet hair while mopping sits uneasy with me. All that pet hair gets caked up and stuck. I'll stick with using two separate devices for 2 different jobs.
@@hectorgarza228 ok what if you have a handicapped cat or an old cat or rescued cat that is without claws and can't defend itself? Or if it's not fixed/neutered. I have a friend that has a cat that she rescued and had to have both back legs amputated. Animals like THAT should def NOT be outdoors. It can't defend itself. So in some circumstances animals should be indoors.
Even with regular mopping or use of a Hoover Floormate the grout/tile will still get dirty over time. We recommend semi regular professional maintenance cleaning of tile and grout floors like the method used in the video.
@@Sacsurfacepro so is it pretty safe to pressure wash grout lines at around 2,000 psi and below? My grout is just stained and inconsistent coloring constantly; bleach/peroxide/baking soda tricks just doesn't work. I want it white. Suggestions?
I’m just curious why you chose to use the brush attachment on the bottom instead of the Teflon. I’ve heard different that’s all, and am also new to this so just want your POV. Thank you! 😊
We did use the Teflon attachment at first but found this works just as well. Our equipment picks up almost all the water with this brush head and the floors dry really fast.
I’d like to see the floor after it’s dried. Wet grout doesn’t look the same as dry grout. Also, show an area which isn’t dirty, such as under the fridge or stove, as a comparison.
When he used that turbo machine I was like 😲😲😲 How expensive are these and can it seriouslybe used on stone, more specifically marble? Awesome cleaning machine 👍
Yes it can be used on stone and even marble. The turbo hybrid tool he's using (around $1,000) has a brush ring attachment that won't damage marble. The trailer mount machine that has the pressure washer, heater, vacuum and tank is probably $15-20k though, and the turbo tool is pretty much worthless without that. (there are cheaper portable machines out there for several thousand but they're a pain to setup and unload and you can only use around 25-50 feet of hose for them still being effective. There are floor machines for honing and polishing marble that sometimes make more sense to use than the turbo tool. A tile and stone professional can look and see if your marble floor just needs a good cleaning or if it needs refinishing.
Yep I tell all my clients that don't have any of their grout sealed that to maintain cleaner grout, is to seal them. But then again if I do that then I wouldn't be hired back. So keep em unsealed and dirty! And a quick tip, I always check the pantry floor to compare it to the kitchen floor. Less foot traffic. That'll tell you what color your grout started off as.
The only reason cleaning professionals have to pre scrub tile and grout is that thedon't have enough PSI and our heart from the truck mount.the turbo and most other spinner tools on the market are sufficient by themselves to clean perfectly time and grout. Abby permanent stains in the grout will be resolved by color sealing, perhaps the most superior sealing method used toady.
Dddddddddddddddddddddddddddddddddddddddd did dddddddddddddddddddddd33dddddddddddddddd dddddddddddddddddddddddddddddddddddddddd ddddddddddddddddddddddddddddddddddddd3dddddddddddd de dd3ddddd dddddddddddddddddddddddddddddddddddddddd ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd de ddd
only with water and pressure is it not possible to achieve these results, what products do you use without burning, staining or removing the enamel from the floor?
anyway to bleach grout white? trying to refurb my flipper but have white tiles on what I suspect is grout darkened over time. I want to get it pearly white if possible
It goes into the truck that was shown outside at the beginning of the video. The red hose attached to the Rotovac leads out to the truck which contains a tank
A real professional would’ve pulled out the stove and fridge, scrubbed the grout lines with a grout brush, scrubbed flat up against the walls with a brush by hand where the machine doesn’t reach, and a real professional would clean underneath that tile wand. Filthy.
Annie, no they don't... ever. Never move refrigerators or stoves as this could lead to damage. If you want the "professional" to clean those areas please have it ready for when they get there. Moving appliances is not part of the deal.
Isaac Ostrom I have tile like that, years of “trapped” dirt. I think the estimate I got for a professional cleaning like this was around $600 or so. But good results!
The pre-cleaning pray and scrub released a lot of dirt from the grout. The floor was actually dirtier due to this, The home owner thinking his floor was that dirty is not correct. The cleaning process made it dirty and the water and vacuum just picked it up.
The cleaner needs to loosen the soil and the CRB breaks it up leaving it ready to be extracted. Having heat, pressure, and suction for the last cleaning step ensures the floors are sanitized and left clean.
Yeah, but you probably labored for 2 hours doing it. Or you can pay someone else to do it for 40 bucks. It's just a matter of what you prefer. But either way somebody has to do the work.
That’s also misleading though. You can wring out a dirty mop and see the dirt. He can come back in a month and you’ll see similar results depending on if you’re “picking up” the dirt when you clean
nvm i found out, its a alkaline based cleaner with surfactant mixed into it. and they use crb machine to agitate the cleaner into the surface and then use a hot water pressure washer with vacuum extraction to remove the dirty material...
Beginning of work and I don't clean as soap andgunsmoke small going to see this big mess cuz that's where we going to get a whooping so bad with the we have to find show me how to clean it up with soap and water what's a good enough for my mom
Not true. The vacuum pressure is not as powerful as you might think. The water pressure is anywhere around 700-900 psi which does not damage the grout.
Thanks for sharing. This is the only TH-cam channel I came across that actually explained what tools to use, oppose to just cleaning the stone floors.
Thank you for your reponse, Gerald! I'm glad it was helpful.
This guy knows exactly how to do it. Love his van and trailer with the heather. Great job
Awesome to see a contractor that is so open and honest about the process and equipment they use. I’ve called someone do do my grout and I wouldn’t have without knowing exactly what’s involved and how incapable I am of doing it.
Thank you K L. That is one of the keys to us being in business for almost 18 years now. Honesty and integrity.
You don't need a $40k machine to do it. You could Rent a buffer yourself and get just as good results.
@@Hallahanify so all I need is a buffer and I'm as good as a professional
@@TheBleetbleet and the right chems. Search on TH-cam, tile and grout cleaning with a buffer
@@Hallahanify okay so I just gotta rent a buffer and research chemicals. Sounds about as easy as any other trade specific diy project. I doubt it would be much more affordable considering.
it was great of you to feature matts business, He is as good as the best in grout cleaning.AND HIS MACHINES ARE TOP OF THE LINE. fantastic video. ive been doing stone restortion ,all stone surfaces since 1988 over 31 years and counting. Marble Miracles Tampa Bay area,florida
Thank you Michael! Wow, 32 years and counting for you now. Great job!!
I’ve been in the business for 16 years and I do have different techniques then him. I agree with most of what he says in the video. In my business we do it all by hand and color seal the grout a color the customer wants. Most of the time matching the color of tile and grout. I would like to reach out to him to see how he likes those machines. I’m here in Florida so no competition towards him. Great video don’t be embarrassed out your floors. They are all that way in the cleanest houses.
We do color seal at times also depending on the condition of the floor. If there is a bunch of staining in the grout, this is the best way to make an old floor look basically brand new or close to it.
WoW Wee Whoa. Nice work Matt and Isaac! I met Matt at a trade show a few years back, definitely knows his stuff. Not just with tile and grout, but granite, marble, and polishing shower glass as well.
Hi Mike! Thanks for the endorsement! Mike really knows how to restore tile and grout, natural stone and shower glass. If you're in Poulsbo, Washington or surrounding areas give him a call. Northwest Tile and Stone Care.
So that machine is basically a flat surface cleaner that is hooked up to a wet vac. Very cool 😎 👌
Yeah when he flipped it over I was like "Oh shit that's a pressure washer."
I have the same thing like that for outside. Minus the wet vac hose of course.
The only difference is these "wet vacs" start at $20,000. 😊 You can easily spend over $100,000 on complete setups.
This was very helpful, thank you. We're having our kitchen remodeled and after they're done I'm going to have my kitchen professionally cleaned. the on knees thing just isn't cutting it. You sound like me, I always feel I need to clean my house before the cleaning lady comes!
Haha! It definitely does happen more often than not with our clients. Glad the video was helpful! Thank you for your response.
Went into a house to redo tub grout & caulk. The grout on the tile throughout the house(had all tile floors) was black. After redoing bathroom, showed homeowner that their grout is supposed to actually be a beige/tan color AND NOT black.....it was that DIRTY! with no sealer/sealant etc... Ended up cleaning it & sealed it & now looks beautiful (just need to remember that a sealer isn’t going to last forever.....will need to be reapplied every once in awhile to keep the grout sealed (water resistant)).
L8R ✌🏻
Thank you. Grout sealant I'm sure is important, especially if you've been doing it yourself all these years.
He's basically using a whirlybird sidewalk cleaning pressure washer attachment, but with a vacuum port on it. When I pressure cleaned sidewalks or decks at my properties, I would rent those large pressure machines, with the Honda engine, and the whirlybird attachments with the pressure washer to do the sidewalks, but they don't have the vacuum attachments on them. Also we've used Stanley Steemer, who does similar to the carpet with their machine on grout as well, and it worked pretty good in one of my townhouse projects. They usually up-sell you when they are doing the carpets, they notice the tile and tell you about cleaning the tile and grout, so we haggle down the price.
Do you haggle the waiter at a high end steakhouse and tell them the price is too much or do you pay the price cause you know your getting a quality steak? These guys have money invested in there business know there stuff , they have been trained and your going to tell them what they should charge to break there back.🤯🤯 smh!
Excellent video, Matt is definitely one of the best hard surface cleaners in California.
Thank you for the kind words Gold Coast Flooring! I appreciate it Nick!
I just realized that's the {damn near, except the vacuum part of it} design for the pressure washer surface cleaner! Genius. Yet I should've came up with this idea. 😤
Matt is one hell of a guy! Never mind the machinery, Matt knows tile and grout!
Thank you Michael! You definitely know tile and grout also. If you're in Las Vegas you need to contact Michael to clean your tile floors!
....just something about men that like cleaning floors.....i cant even help it. Im in love. 😆
Right! Esp ones that are eye 🍬 candy
I used a McCullough steamer on my kitchen grout lines and they came out great.
What model do you have? And you just passed the steamer along the grout and wiped it up with a cloth?
Seb Joseph The MC1275 model and yes I used a rag to clean up.
👍Hard work, nice results!
What did he use to get the corner areas and tight spaces around the fridge etc?
You are correct. The machine does not get right up to the edges. We have to go back and detail the edges by hand.
Awesome. I do more of manual and it is very difficult and inflict injuries to my hands when i really want to give my best.I would like to to know more and how to aquire the basics. I'm in Nigeria, West Africa.
Droppin a comment just to say THANKS BRO LETS GOOOOOOOOOOOOOOOOOOOOOOOOOOO
Floors look great. What prespray are you guys using?
I like the the emphasis on using bases vs acids😍
AWESOME VIDEO 10 STARS🎉🎉🎉
Can you do another video at my house? The quality wasn’t good.
😂😂
Khoa sent me here
A before and after photo would be nice. I have been using a hoover floormate to clean and vacuum dirty water off of my tile floors. I would use that over damp mopping anyday.
Is that the all in one vacuum/mop? Who ever invented that needs to be punched in the throat. Something about vacuuming pet hair while mopping sits uneasy with me. All that pet hair gets caked up and stuck. I'll stick with using two separate devices for 2 different jobs.
@@partnersNgrime people who keep animals indoors should be punched in the throat something about that sits uneasy with me
@@hectorgarza228 ok what if you have a handicapped cat or an old cat or rescued cat that is without claws and can't defend itself? Or if it's not fixed/neutered. I have a friend that has a cat that she rescued and had to have both back legs amputated. Animals like THAT should def NOT be outdoors. It can't defend itself. So in some circumstances animals should be indoors.
Even with regular mopping or use of a Hoover Floormate the grout/tile will still get dirty over time. We recommend semi regular professional maintenance cleaning of tile and grout floors like the method used in the video.
@@Sacsurfacepro so is it pretty safe to pressure wash grout lines at around 2,000 psi and below? My grout is just stained and inconsistent coloring constantly; bleach/peroxide/baking soda tricks just doesn't work. I want it white. Suggestions?
Thank god, someone that doesn't say spickit.
Okay. So the best way up clean tile and grout is to call Matt. Got it. 😉
LOL that's good!
Can’t believe Big John McCarthy started a tile cleaning company
Very well done video!!!
I’m just curious why you chose to use the brush attachment on the bottom instead of the Teflon. I’ve heard different that’s all, and am also new to this so just want your POV. Thank you! 😊
We did use the Teflon attachment at first but found this works just as well. Our equipment picks up almost all the water with this brush head and the floors dry really fast.
Really should have shown the clean tile again. That one glimpse while he was doing it was not enough. We know enough about Matt.
I’d like to see the floor after it’s dried. Wet grout doesn’t look the same as dry grout. Also, show an area which isn’t dirty, such as under the fridge or stove, as a comparison.
I would have liked to see the results. It looks like the tile is clean but the grout wasn't.
They didn't do a good job of showing the final result but I think the grout will brighten-up & look cleaner once it dries.
It is a dark grout
Brown grout is always brown grout.
The grout needs to be color sealed after cleaning to get the best result and most durable protection.
okay so where do you get these tools meaning where can I rent them or do I have to call a professional service?
Can this machine be use on "Mytee 10 gallon Contractor Extractor"?
do you pair this with a carpet machine extractor? or what is the name of the machine that its hooked up on
No, this machine extracts the water and fills up in the waste tank. When full, the dirty water is emptied into the sewer.
Really good video. Thank you.
The grout was still dirty but the tile was clean.
I agree the grout was not clean
@Furious Fucshia Goddess nah grout wasn't C!wanted at all
A commercial grade dupray steam cleaner would be appropriate to use on the grout first, then this tool.
All grout is not white. This one was a brown grout that was black when we started.
Not white grout dum-dum
I LOVE IT
HOW MUCH DOES IT COST
Nice explainer!
What is the pre clean solution
How do you connect it to the water
When he used that turbo machine I was like 😲😲😲 How expensive are these and can it seriouslybe used on stone, more specifically marble?
Awesome cleaning machine 👍
Yes it can be used on stone and even marble. The turbo hybrid tool he's using (around $1,000) has a brush ring attachment that won't damage marble. The trailer mount machine that has the pressure washer, heater, vacuum and tank is probably $15-20k though, and the turbo tool is pretty much worthless without that. (there are cheaper portable machines out there for several thousand but they're a pain to setup and unload and you can only use around 25-50 feet of hose for them still being effective. There are floor machines for honing and polishing marble that sometimes make more sense to use than the turbo tool. A tile and stone professional can look and see if your marble floor just needs a good cleaning or if it needs refinishing.
This tool now retails for around $795 High-pressure auto filling auto dumping portables you can get for about $3500
Mark Markovic name of the company to I can buy this machines?
Where can we purchase this machine from?
good video.
Yep I tell all my clients that don't have any of their grout sealed that to maintain cleaner grout, is to seal them. But then again if I do that then I wouldn't be hired back. So keep em unsealed and dirty! And a quick tip, I always check the pantry floor to compare it to the kitchen floor. Less foot traffic. That'll tell you what color your grout started off as.
How can I see your trailer setup
what's the name of the first machine did you use???
The only reason cleaning professionals have to pre scrub tile and grout is that thedon't have enough PSI and our heart from the truck mount.the turbo and most other spinner tools on the market are sufficient by themselves to clean perfectly time and grout. Abby permanent stains in the grout will be resolved by color sealing, perhaps the most superior sealing method used toady.
Kkandbabyj sent me here 😂
Oddly satisfying
Hey Isaac Ostrom Would you be at all open to a side project if it didn’t interfere with what you are currently doing?
Dddddddddddddddddddddddddddddddddddddddd did dddddddddddddddddddddd33dddddddddddddddd dddddddddddddddddddddddddddddddddddddddd ddddddddddddddddddddddddddddddddddddd3dddddddddddd de dd3ddddd dddddddddddddddddddddddddddddddddddddddd ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd de ddd
Links on the equipment used ??
Can u use this in a kitchen like a big one
How long do I have to tile cleaning for one hour two hours Depending on the job Small bathroom Give me some Ideas ?.
only with water and pressure is it not possible to achieve these results, what products do you use without burning, staining or removing the enamel from the floor?
Where can I buy one
Where did you purchase the alkaline solution for the floor?
You can get these products at Interlink Supply or Jon Don. tlccarpetcare.net
What was the price tag?
The grout lines are still dirty ??
Not every grout is white...
how much does one of these pressure washer cost and what is the name ? i want to start a business doing this
You might want to mount the truck mounted unit to a truck. 😊
How much did your equipment cost and where did you get it?
whats the name of the machine used please ???
What's the name of that Machine??
Tools must be kept clean, too!
After that cleaning I would put a sealant, to protect the surface again dirt.
how much would these pro jobs costs.
where can if ind that at walmart, or closet to machine?
How about pricing?
anyway to bleach grout white? trying to refurb my flipper but have white tiles on what I suspect is grout darkened over time. I want to get it pearly white if possible
Wow 😳
We're do you empty all the dirty water?
It goes into the truck that was shown outside at the beginning of the video. The red hose attached to the Rotovac leads out to the truck which contains a tank
A real professional would’ve pulled out the stove and fridge, scrubbed the grout lines with a grout brush, scrubbed flat up against the walls with a brush by hand where the machine doesn’t reach, and a real professional would clean underneath that tile wand. Filthy.
Bruh there just coming to clean, there not furniture movers
Annie, no they don't... ever. Never move refrigerators or stoves as this could lead to damage. If you want the "professional" to clean those areas please have it ready for when they get there. Moving appliances is not part of the deal.
Let the man clean HIS OWN house to the degree of cleanliness her is comfortable with
Was the grout a dark color or was it dirty before?
Isaac Ostrom I have tile like that, years of “trapped” dirt. I think the estimate I got for a professional cleaning like this was around $600 or so. But good results!
What PSI does the turbo run at??
1,200 psi
Pricing??
what kind of soap do they use, i was wondering if there could be more non toxic and more green options to put as an option to the soap
i have the same tiles..i HATE them....what about the grout...i used to mop with bleach...now i use microfiber towels....but it's sooo much work...
WHERE CAN WE FIND SOMEONE IN WEST LOS ANGELES CA PLEASE
Tile clean 🧼🥰 but the grout still looks dirty
No. The grout is clean. You can't see it white because it is wet. You will see the final result when the tile and grout is really dry
The pre-cleaning pray and scrub released a lot of dirt from the grout. The floor was actually dirtier due to this, The home owner thinking his floor was that dirty is not correct. The cleaning process made it dirty and the water and vacuum just picked it up.
Can i make an appointment
What PSI are you cleaning at?
I use about 1000 psi
The pre spray and CRB did most of the cleaning. A wet vac could have done the rest.
The cleaner needs to loosen the soil and the CRB breaks it up leaving it ready to be extracted. Having heat, pressure, and suction for the last cleaning step ensures the floors are sanitized and left clean.
Bleach, Palmolive, hot water and a brush. I got way better results and I didn’t even spend 40 bucks
Yeah, but you probably labored for 2 hours doing it. Or you can pay someone else to do it for 40 bucks. It's just a matter of what you prefer. But either way somebody has to do the work.
@@eknight101 yes. It worth it not to break you back and use a toothbrush
@@eknight101 more like a couple hundred dollars minimum. Nobody is doing this for $40
@@ohboy2592 yes, I stand corrected . expecting this much work for $40 Would be in insult to humanity.
I’ll drive the turbo please. The other vehicles don’t give me the same rush
All the grout lines didnt turn white. Why is that?
Yeah, let's not show the finished product.
It doesn't look like the grout was cleaned at all... unless that was dark grout to start with.
This one was a brown grout that was black when we started.
How do you not ruin wood cabinets?!?
hello brother can u leave machine details for me
That’s also misleading though. You can wring out a dirty mop and see the dirt. He can come back in a month and you’ll see similar results depending on if you’re “picking up” the dirt when you clean
Those dimples! 😉🤭
i wonder what chemical they are using?
nvm i found out, its a alkaline based cleaner with surfactant mixed into it. and they use crb machine to agitate the cleaner into the surface and then use a hot water pressure washer with vacuum extraction to remove the dirty material...
Looks like a surface/patio/deck cleaner with a hose the suck up the dirty water.
Tile looks clean. Grout still looks terrible.
I agree, it needed an extra scrub with a pointed brush and/or an acid clean.
It is actually the original color of the grout.
Beginning of work and I don't clean as soap andgunsmoke small going to see this big mess cuz that's where we going to get a whooping so bad with the we have to find show me how to clean it up with soap and water what's a good enough for my mom
You should get a before and after shot! It looks like they did a good job, but there's no proof of that here. Haha jk. Nice vid anyways.
steam cleaning tiles lifts the grout later on..not good to steam clean just clean
Not true. The vacuum pressure is not as powerful as you might think. The water pressure is anywhere around 700-900 psi which does not damage the grout.
Don't ever enter your house wearing shoes or slippers you wear outdoor