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Google, man, google. On "electrolytic rust removal."
The electrolyte is sodium carbonate (washing soda) NOT sodium bicarbonate (baking soda.)
The rusty part is the cathode, a piece of scrap iron or rebar is the anode.
I have read of both 6 and 12v battery chargers or big batteries being used.
If you want cold chemistry, Evaporust works; just don't expect it to work in the few minutes claimed on the label.
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