Looking for information on how to properly restore my aluminum grill. Its not bad enought to replace but its seen many snowstorms.... I have polished it but the finish still shows signs of wear. There appears to be a coating over the aluminum that can be rubbed/polished off. Is this simply a clear coat that can be removed, the grill polished and then recoated. If so what kind of coating is it. Searchs of this site and www have not produced any information ( or I'm just not looking in the right places...) Thanks for any help