I'm thinking about getting a Royal schemed Rota wheel. I assume the "polished" portion of the rim has a clear coat over it. Does it, or is it bare metal? What I want to know, is if I wash my car once a month (if that often)...with just regular car soap and water (maybe a little Simple Green), will I see the same brilliance from the wheel as the day I bought it? With my current non royal SDRs, this is the case.