[rodneym]

While toothpaste has abrasives in it that may do the trick (it's an old plastic watch 'crystal' polishing trick), I'd stick to purpose made polishes.
Plus, aluminum has different grades that may polish better than others. My Kirkham hood scoop is probably softer than the body. It's polishes to a different degree than the rest.
Get in touch with Tom at Nuvite (think that's his name). Email him some pics. He'll lead you in the right direction.