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Coke. Full fat. Put it in, leave it and give it a rub. Beautiful :) or Cilit Bang....Bang and the dirt is gone.

Yes BUTTTTT ....NEVER, EVER try to clean valuable coins to make them "look better". Dumping a modern penny in Coke to see what happens is a good chemistry experiment, but don't try it with an Indian penny from your grandfather's coin collection because it'll go from being worth possibly several dollars as a collectible, down to only a cent or two as a damaged coin.
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14y ago

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