Any flat internal surfaces, I'd get some real fine grit, 400 or smaller, wet or dry sandpaper. Put it on the flatest surface you can find, and wet sand them back flat and clean. Any other surfaces, you could mask off the flats and carefully blast them, but I'd try to use soda as it will not cut the aluminum, but should do the oxide. This is what they use with aluminum airplane parts when they restore old planes. Sand would be bad and glass beads not quite as bad as sand.
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