Some Pennies and Coins Like Silver, Gold and Proof and other coins worth a lot of money should not be cleaned unless by a professional.

Coins will lose their value if you clean them and cause blemishes.  Gold, silver and rare coins must be pure and blemish free.  Keep them that way.

Products like Brasso and cleaning agents can ruin rare coins and they will lose their value when you try to sell them.  Proof coins should be kept in an airtight container so they do not corrode.

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