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Originally Posted by Kobuchi
Swish diluted acetic acid plus a little sodium in it - the copper will be clean and bright in seconds. Rinse. Yes, that's just vinegar and a dash of salt, and extra water if you're really cheap.
Boiling it in a covered oven roasting pan will free any oils trapped in there.
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just to clarify, I hope no one actually puts sodium into water in an uncontrolled environment
sodium chloride will do though