Have you polished the lights with a polishing buffer,I`ve got a big commercial buffer,polishes lights up in no time, makes a mess with all the splatter tho.
saw a thing on mothers car show where they used cuttign compound and a powerball (mag wheel cleaner thing on the end of a drill) worked it in slowly then went nuts. then polished it with plastic protector stuff.
Meguiars PlastX brought the Supra lights up nicely, except to get it perfect I'll have to do the insides too... There's an article on mkiv.com somewhere about doing it, they went hard though with wet-sanding etc...