ANSWERS: 4
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I would have said soak it overnight in cola... but here is a page on how to clean coins without damaging them... http://coins.about.com/od/caringforcoins/ht/cleancoins.htm
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Ask a coin dealer, because if it is valuable and you use the wrong cleaner, you will ruin it's collectible value.
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Don't clean it. Cleaning coins makes them worth so much less. Even if a professional does it.
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Rubbing alcohol works wonders on all sorts of things, especially CD's and DVD's.
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