If the aluminum is turning black when you use polish, it's not clear coated.
Aluminum on it's own will pit and turn hazy and will need all sorts of upkeep to look good.
I hear Optimum Metal Polish is good and I know Adam's Metal Polish 1 and 2 are good. Either one should be worth a try.
If you do get it to perfect, think about possibly clearing it, as otherwise in a few weeks/months, you'll have to do it all over again.
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