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>phosphoric acid is also used to remove rust, maybe it works? Try coca cola.
> I tried HCl once, it doesn't work! I've also tried bleach (chlorine) and
> H2O2 and they didn't work, either. I remember reading in an old book
> when I
> was a kid that oxalic acid was useful for removing rust stains, this was
> long before PCBs were invented.
> Leon