This really isn't somthing that is too horrble, but how does one remove rust? On my Royal KMG there are spots of rust and tarnish on it's steel parts, like the tab pins or the Magic Margin bars, since it was stored away fro years in a school prop closet. Is there a simple and easy way to remove this rust? It doesn't affect the functions, but I just want to make it a bit more cleaner since the KMG is the best standard I got unless I get the Olympia SG1.