How do I clean rusted pennies?
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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.
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
Cola will clean them with little effort. Also vinegar and baking soda. Rinse and let dry when done.
Use toilet bowl cleaner on them. Or liquid rust remover from walmart.