to get anodize off, I have had great luck with Easy-Off oven cleaner. it eats the anodize right up. I have had it strip off cheaply anodized aluminum parts in as little as 5 minutes, a bit longer with a good anodize job or on stainless
the only drawback is that it will tarnish the parts pretty good (much worse on aluminim than stainless), but it's a lot easier sanding away a little tarnish than sanding off anodize
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