I found a heavy over 1/2 sheet of at least 3/4" (maybe thicker) plexiglass a guy threw away when he was cleaning out his shop.It could use a good cleaning and maybe polishing.I know I can use it when making some jigs or something in the shop.I was just wondering if there is a way to clean it up...Just looks like it has been laying under the shop table and gotten dirty , scraped up etc.The dirty part I can handle but is there a way to polish or getting it closer to how it once looked? Just curious...Its still usable regardless ...Thanks Guys!