Regular PMMA-acrylic like Plexiglas is often polished with heat (like a acetylene-torch or similar) but Polycarbonate like Lexan needs to be polished to get shiney again. At work Im using a polish-compound specially made for Plexiglas, which is distributed by our local Evonik/Degussa/Röhm (Plexiglas) -dealer, but I dont remeber the brandname of it. Most polish-compounds will do the job quite well but make sure that you try it out on a spare-Lexanpart before you use it on your actual lure-part.