Handle coins by the edges only
Rinse gently in distilled water
Soak briefly in distilled water if needed
Pat dry with a soft lint-free cloth
Use a soft brush only if dirt is loose
Avoid scrubbing or rubbing the surface
Avoid soap, vinegar, baking soda, toothpaste, and abrasive cleaners
Avoid polishing or chemical dips
Do not use metal tools or abrasive pads
Dry completely before storing
Store in inert holders or coin flips
Consult a professional for valuable or rare coins