Handle coins by the edges
Rinse coins in distilled water
Soak coins in distilled water if needed
Gently wash with mild soap and water
Use a soft cotton cloth to pat dry
Use a soft-bristled brush only if necessary
Avoid scrubbing or abrasive materials
Avoid vinegar, bleach, and harsh chemicals
Avoid polishing or buffing
Dry coins completely before storing
Store coins in acid-free holders or capsules
Consult a professional for valuable or rare coins