by Jer Reclusado
Soak them in ketchup for a while.
In water and baking soda
1/4 c Baking Soda , 1/4 c white cleaning vinegar (will fizz), a drop of blue Dawn, and 2 qt hot water. Let soak.
You put them in Coca-Cola and we'll eat all the yucky stuff off the penny and make them nice and clean
Here's an easy video: https://www.youtube.com/watch?v=H4N-iGvYrbM
Vinegar + baking soda!
5 ways to clean pennies: https://www.thesprucecrafts.com/ways-to-clean-pennies-4151742