My phone already has 3 decent scratches on it. It's not the end of the world but I'm thinking about just cutting to the chase and taking all the black off. I think it will look like a homage to the original iphone being raw, and black. \ Question is what is the safest way to achieve this? I actually have access to a polishing wheel, but I think that may be overkill. Should I just start with a low grit sand paper, and see how it goes, or maybe a chemical solution? I want to achieve a brushed finish, not shiny FWIW. Any advice from people who have worked with metal would be appreciated.