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Unfortunately, there isn't really anything that can be done to clean them. The coins are coated with zinc, which has its own oxidation problems, and combined with rusting steel underneath it makes a nice chemical mess. Anything you have at home will only make the situation worse, long term.

Zinc on steel proved to be unsatisfactory just within the first few months of use. It was so bad that copper coinage was resumed in 1944 in spite of a desperate need for that metal in making weapons.

In any case, unless the coins were in XF or AU condition to begin with, they'd only retail for 25-50¢ so you are not out a huge amount of money.

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17y ago

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