is there anything out there that cures this permanently without having to buy lights all the time i cleaned them with light abrasive rubbing compound they look good for aqwhile then the film comes back does anyone have ideas? i know someone else must hbave this problem thks i have a 93 sc 300

 

How long before the film comes back? Try some Meguiars Plastx and use it every so often when you see the yellowing coming back.

 

wet sand with 1000, then 2000 grit sandpaper... then polish with plastx...

it will last longer, if the problem is only on the outside...