Folks
You can get rid of any discoloration in poly using two simple methods. If you have a blurred effect on the poly, just put it in a small container with one drop of cyanoacrolate (crazy glue) Do not put the glue on the part, just next to it. Leave it somewhere warm for a while and it should do the trick. Warm does not mean in the oven! 70 or 80 degrees f. is fine. The vapor reacts with the polycarbonate. Also, if you have a smoked surface (usually matted or whitish in color) it can be treated by buffing with scotchbrite. If you dont have scotchbrite, just get a new sponge from your kitchen. The type that has the rough plastic scouring material on one side. That stuff is esentially "scotch brite". If the poly was turned on a lathe, and is heavily smoked, just put a little baking soda or even white toothe paste on the scotch brite for the first bit of polishing.
Hope this is helpfull..............