I have a magic mouse I bought a long time ago, back when they where new, and I just found it and cleaned it off and plan to use it, but the surface is scratches. Is there any fix for this? Could I just polish it, or would that damage the mutlitouch surface? Seeing as how they're $70, I really would like to continue using this one as it has no other damage besides minor cosmetic damage on the back(the side where you put the batteries in at) and the scratched surface.