How can I best clean coins?



Answers:
Ultrasonic cleaner either with water or MILD detergent.

Other answers:
leave it in coca cola or pepsi
leave it in coca cola or pepsi
assuming theyre copper or monel metal,dip them in dilute phosphoric acid,scrub the muck off with a toothbrush,rinse in lots of water.
Gold and silver need different treatment.
Oxi clean or cillit bang
"SILVO" works too. I bet brasso does as well.
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