i could be wrong here, i'm no expert at all.. but one would tend to believe that the bulbs themselves are what is coated??Resist said:Cleaning up a plastic headlight is not a problem. The problem is that in doing so you remove the UV protection from the headlight. Now it will just turn yellow and get brittle.
haha!Resist said:If someone could find a way to restore the UV coating on the headlight (other than slapping on some sunblock), we could save a ton of money. The headlights aren't cheap to replace.
You could always try a Dodge Caravan headlight lens with the clear coat to experiment with. They are the worst for yellowing, and there are millions around. I cleaned up a pair from a friend of mine in a similar manner, but didn't use the sanding first, just some paint polish and a buffer and they came out almost as good. That was about 7 months ago and they haven't yellowed back much, if any.