Dremel rotary tool is your friend. Use that with the Mothers Mag and Aluminum Polish and its done in a couple minutes.

Plus with the dremel you can now cut, grind, drill, polish and so many other things any items yuo want. I've used my dremel to cut bearings, cut bearing races, cut off rusted nuts, polish metal, cut fiberglass, and a whole list of other things. Comes in very handy.

The mothers Mag and Aluminum Polish will work by itself but you will need a little elbow grease to get it done.
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Charles Gallant