How do you remove an autograph from a basketball?

I've got a full size basketball with a few players on them, one being Trevor Ariza and others like Travis Dienor, Brian Hill(ex-coach), Darko Milicic. I want to remove all but the Ariza, is there anyway? They were wrote in a silver pen.|||I don't think you can remove autographs.|||I would say to use some sort of graffiti remover. I work at a movie theater, and we have people tagging theaters and we have a spray that helps clean it off. I would try that.