Wash your hands and wear cotton gloves
Hold coins by the edges only
Rinse the coin in distilled water
Soak the coin in distilled water if needed
Gently remove dirt with a soft cotton swab
Use mild, non-abrasive soap only if necessary
Rinse thoroughly with distilled water
Pat dry with a soft lint-free cloth
Air dry completely on a clean surface
Never scrub the coin
Never use polish, toothpaste, baking soda, or abrasive cleaners
Never use vinegar, ammonia, bleach, or harsh chemicals
Never use paper towels or rough cloths
Store the coin in an inert coin holder after drying