The back of my iPod has the really nice mirror finish, but it always gets fingerprints on it. I'm wondering how I should clean it. With the screen, I just fog it with my breathe the brush it with a cloth and that works. I tried that with the back but it didn't work. I'm thinking about using something like windex, will that effect my iPod? Should I maybe use a damp cloth? I just don't want to damage anything on the inside.