Mix equal parts white vinegar and salt
Soak the pennies for a few minutes
Rub each penny gently with your fingers or a soft cloth
Rinse the pennies with clean water
Dry the pennies completely with a soft towel
Use baking soda and water for a gentler cleaning paste
Apply the paste and rub lightly
Rinse and dry thoroughly
Avoid harsh scrubbing
Avoid cleaning valuable or collectible pennies