How to restore plastic headlights from yellow to clear again?
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Try tooth paste applied with a rag
There are many types of plastic that do discolour to a yellowy tone, simply from prolonged exposure to heat. How old are the headlight covers?
Good old standard white toohpaste.Rub on let dry,wipe off,repeat as needed
The are quite a few household products you could use. This aricle might help - http://www.allannott.com/blog/how-to-make-foggy-headlights-clear-again/
Try mayonnaise with a rag.
16yrs is a very long time for plastic to have been exposed to the heat of the bulbs, and also to have been outdoors in all weather and road conditions.
I would say that the discolouration is most likely permanent at this stage.