https://www.thespruce.com/clean-coins-safely-768309
If you mean collectors value DO NOT CLEAN THEM. Cleaning them can lose 50% to 70% of their collectors value.
Never clean coins
You can try this
http://www.numismaster.com/ta/inside_numis.jsp?page=how-to-handle-clean-coins
Any cleaning will hurt the value but if you must then clean pennies with vinegar and baking soda.
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https://www.thespruce.com/clean-coins-safely-768309
If you mean collectors value DO NOT CLEAN THEM. Cleaning them can lose 50% to 70% of their collectors value.
Never clean coins
You can try this
Any cleaning will hurt the value but if you must then clean pennies with vinegar and baking soda.