Chemicals no; media tumbling maybe. problem is there is about thousand different typs of media for polishing. The wrong one could destroy the part. I have to wonder why I never hear of aluminum being polished with media tumbling. In any case, if the part has anodising on it that will have to be removed first. Basically the anodising will have to be sanded off. Some use the help of Easy-Off oven cleaner.
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james
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