Rubbing alchohol is fine to use. It's used in the electronics indusrty all the time to clean electronics. Sure if you use really cheap watered down stuff it won't work as well but 70% and up should work fine in most circumstances. And Windex has rubbing alchohol in it anyways...as well as ammonia, dyes, and fragrances which aren't an industry standard for cleaning electronics.

Clean your games and clean your system and you should be good to go.