It'll probably need to be refinished. I'm 99.99% sure they are clear coated. Once this is destroyed the only way to fix it is to refinish it. If these are indeed painted I can almost promise you metal polish of any kind will damage the paint, if not remove it completely. Your best bets are to live with it, or replace it. I'm gonna guess it will probably cost more to refinish it then to replace it. It's a tough call. Make a few calls just to get an idea.