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As mentioned, aluminum oxide is hard and subsequently hard to remove. There are any number of corrosive cleaners that can be applied with associated risk to the person doing the work and release of caustic run-off into waste streams. In most of these circumstances physical brushing or scrubbing would be required as well, increasing the exposure risk to the worker.
In my feeble opinion, bead (or sand) blasting would be less toxic if available. Alternatively if there is a commercial cleaner in your area that could dip the parts at least the exposure to corrosive chemicals would be contained and minimized.
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gary
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