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I have been using this trick for years. All you need is a small bottle of Trechas or Lucas (chili powder that contain tamarind,red peppers, salt, sugar). I put one table spoon in hot water and let the parts soak for 2 min. I'm sure it's the citrus acid that does the trick, but where I live it is cheaper and easier for me to find this at $1.00 a bottle. No scrubbing, and will clean the darkest nastiest copper you can find.
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