perhaps easy off, but i use a lye solution. it's a chemical to clean out drains. it's very aggressive. i mix a teaspoon or so into a 1/2 filled coffee mug and watch it fizz and get warm, then drop in my aluminum and stir as the solution turns the color of the anodizing. soon i have silver or greyish parts! they need rubbed or polished afterwards, but it sure beats sanding off the anodizing.
it's available at supermarkets. also, be careful not to breath in the fumes and don't let it sit on your skin too long. not too healthy.
that's one way.
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