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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
Before you do anything, remember that you should never clean coins that you think may be collectible as this can greatly devalue them. If this isn't an issue, then for oxidized pennies, you can soak them in 1/4 cup vinegar mixed with 1-2 teaspoons of salt for a few minutes. Just be sure to rinse off the vinegar with water after you've soaked them, since any remaining vinegar residue could cause the coins to oxidize again.
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