Also, try using Tartar Control Crest toothpaste and a soft toothbrush. It was one of those "Hints from Heloise" years ago that has served me well on my glasses, sunglasses, and yes -- even the plastic gauge lens on my Chevy. Most toothpaste (except the gel kind) has very, very fine abrasives that work well for polishing. -Dave Stragand VIN #05927