Sort the pennies by condition
Wash your hands before handling them
Rinse the pennies with distilled water
Soak them in warm water with a drop of mild dish soap
Gently rub each penny with your fingers
Use a soft toothbrush for stubborn dirt
Rinse thoroughly with distilled water
Pat dry with a soft lint-free cloth
Air-dry completely on a clean towel
Avoid abrasive cleaners
Avoid vinegar, lemon juice, and other acids
Avoid scrubbing with metal tools
Handle valuable or rare pennies carefully
Consult a coin expert before cleaning collectible pennies