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Using a liquid with a mild acid will clean copper pennies the best. It may take time, but it does work better than nearly everything. Vinegar and lemon juice are examples of cleaners, and seem to be the best and most easily accessed mild acids. Ketchup (because of the vinegar in it) is also known as a good penny cleaner.

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โˆ™ 2009-05-05 19:08:16
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Q: What liquid cleans copper pennies the best?
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