Guys- I'm no metallurgist, but I think I remember that galvanized metal works because the zinc in it gets oxidized and spares the iron in the steel. When this starts to get used up, it probably would change the fininsh of the steel to the point that polishing won't fix it. What MIGHT work, (and I don't know this for sure-never tried it) would be to put a coat of automotive clear-coat on it. This would put the shine back on and maybe stop the oxidation for as long as the clear-coat lasts. Don't know how successful this would be, I know regular paint won't stick to galvanized metal. Might have to be content with that rugged weathered look.