I've seen many tips around cleaning chips and decided to give Sterling Magic a try. It worked great on several chips until I used it to clean a newer roulette chip and it promptly removed the hot stamp. (Even though I just rubbed it with my fingers) Has anyone else had this problem w/ Sterling Magic? I have an older chip that needs cleaning and I'm wondering how I should clean it? It is a Horseshoe "Joe Brown's" $5.00 chip so I definitely don't want to ruin the hot stamp on this one. I've seen the tips on the club site but wondering what others use to clean older chips w/ hot stamps?