There is a chemical that can take care of the anodized layer. Caswell's Anodize & Chrome Stripper. But if you are in a hurry you can use Drano powder. Be sure you get the powder Drano and verify the ingredient is Sodium Hydroxide (LYE).
If you do go with the Drano, be advised it does not have any inhibitors in it like Caswell's stripper. So you will need to keep a close eye on the part to make sure you don't strip the aluminum as well. Use a multi-meter to check for continuity of the part. Anodized aluminum will not conduct electricity, so when you hear the beep, which means it’s done.
Also, watch out for the fumes, they are not deadly, but can induce an asthma attack in asthmatics.
Hope that helped ;o)
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