My 4nine gets a dirty penny patina from being in my pocket at work and I want a quick way to polish it to look like new. Has anyone tried Kaboom bathroom cleaner? I've used ketchup and it works OK but its still dull. I used white toothpaste this morning but it was very time consuming. I've been using the Google machine and most everything I read said Kaboom works really well but one person said it almost dissolved his old copper coins. Anyone have any luck with using it on a mod? Would it cause pitting? I'd hate to destroy it, but I also want a really quick way I can clean it every other day or so.