Hi, Steve. As impact resistant as Lexan or other polycarbonates are, they also scratch easily. If you are in an area that has industrial plastics suppliers, I would find one or more in the phone book. I know that my favorite plastics store has many different cleaners and polishes specially formulated for working with clear polycarbonate. And they should be able to give you some direction as to which ones are best for your problem. If you are close to Cleveland or Detroit, let me know and I'll pass on the suppliers name.