I had good luck with GS27 scratch remover on my Taurus which has crystal clear lights. I just bought the car used and they were neglected. It also got the gunk film off of them too. You can get a bottle at wal mart, pep boys,...

HTH John

96 GL Sport
KKM Filter
Sony CDX 680
Pioneer 6x8's
MTX Thunder 250
Xplod 12"
Yakima roof rack
Working cup holder