I have a variety of old game boxes both cd cases for the playstation, dvd style cases for newer systems, and a couple older style boxes for gameboy games. However what I'm most interested in, and what is most relevant is if you guys had any tips for cleaning up my dvd style cases to make them more presentable.

Several have stickers on them, a variety of gunk (I don't even want to guess what that stuff is) building up on the covers, and a couple have even been written on with a sharpie.

Does anybody here have any tips for getting these cases in a presentable form?