Restoring a foggy headlight with acetone vapor - GIF

[odd one]

I have done this, and it works great........as long as it is the right type of plastic. Cut the top off of a soda can and tapered it down to wrap around a piece of conduit and sealed with tape. Poured Acetone down conduit and used a heat gun to heat and cause the Acetone in the can to evaporate. Made my Subaru headlights clearer than any other method that I have ever used before at a fraction of the time and no mess. However, it totally fogged/hazed my Hummer fog lights. My chemistry and laziness prevent me from learning what the compatible plastics are and what type of lenses that I have. Now I get to upgrade my fog lights. This does not restore any UV protection. I seem to have to do it about every 3 months. Takes less that 5 minutes to do both.