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I have read good things about electrolytic rust removal.
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^^^^This^^^^^
i use reverse electrolysis for all my rust removal projects. Most folks use Arm and Hammer washing soda for their reverse electrolysis; i prefer Red Devil lye.
Do it outdoors and be careful: The procedure generates hydrogen gas. Metal parts will have a black coating when removed from the solution. This must be removed quickly. If allowed to dry its hard to remove. Oil the de-rusted metal ASAP.