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I like the electrolysis method. I bought a plastic storage tub at Walmart for a couple of bucks. I've been using lye which I found at the grocery store in the drain cleaner area. Look up the exact procedure and make sure you get the polarity right on your charger. One of the nice things is it essentially quits when the rust is gone. You don't have to worry about overdoing it. I salvaged a number of internal transmission parts in my tub as well as some nasty old brake drums.
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