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Can you clean your coins, if yes, with what? - APMEX

This is Why You Shouldn't Clean Valuable Coins

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I know cleaning coins is considered taboo, but won't the blue oxidization on the pennies spread like cancer unless it's removed? I'm not sure how to approach the Morgan either. Thanks in

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any suggestions in how to clean the silver coins? : r/coins

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Are My Coins Valuable?, Carolina Rare Coins And Currency