i had the same problem on my caravan. i tried everything, until i ran into this cool headlight kit on ebay.
you should check it out it actually got rid on that rough surfac AND the yellow discoloration.
heres a link of where i bought it:
http://stores.ebay.com/Headlights-Gu...3aFQ3aSTQQtZkm
link
[quote]ORIGINAL: Stang_GT_91
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