Why not use a scotch bright pad? I’ve used them on my boat in the ares where I do not want to polish. Works great and you get several levels of abrasiveness. They have silicone carbide or aluminum oxide which I think is okay on aluminum:
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Copper does not play well with aluminum, you are better off with Brillo pads which is what the Feather Craft factory recommended.
If you’re looking for something less abrasive there is always aluminum wool, it shines the aluminum if it’s already clean and smooth.