Pro Tip - NEVER sand any other type of solar panel. The oxidation seen here is not from the solar panel, but the lens that is over it (likely polycarbonate) They oxidize similarly to the lenses on automotive headlights because they're largely the same material in the same conditions. Typical rigid solar panels have a glass cover, flexible and folding panels also have a different cover material than these little garden lights as well. If you want the most protection for these little lenses your best bet is to treat them how you would your headlights when doing a restoration on those. Sand in stages until you can swap to polishing to give the smoothest, clearest finish possible.
Pro Tip - NEVER sand any other type of solar panel. The oxidation seen here is not from the solar panel, but the lens that is over it (likely polycarbonate) They oxidize similarly to the lenses on automotive headlights because they're largely the same material in the same conditions. Typical rigid solar panels have a glass cover, flexible and folding panels also have a different cover material than these little garden lights as well. If you want the most protection for these little lenses your best bet is to treat them how you would your headlights when doing a restoration on those. Sand in stages until you can swap to polishing to give the smoothest, clearest finish possible.