If your pennies are collectible or rare, do not clean them, they lose their value. If cleaning for a project, clean away! Vinegar and salt will do it, here is a link.
If you are cleaning them for a project, try Bar Keeper's Friend. But if you are cleaning them for a coin collection, DON'T! They will lose value if they have been handled or cleaned.
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Here is a website with a few different ways to clean pennies.
https://m.wikihow.com/Clean-Pennies
If your pennies are collectible or rare, do not clean them, they lose their value. If cleaning for a project, clean away! Vinegar and salt will do it, here is a link.
https://m.wikihow.com/Clean-Pennies
https://www.youtube.com/watch?v=H4N-iGvYrbM
soak in coca cola
salt and tartar mix polishes pennies
Rub shiny with ketchup!
All great tips. I agree with Naomie. If they are rare DO NOT TOUCH them. They lose 70% of their collector value.
If you are cleaning them for a project, try Bar Keeper's Friend. But if you are cleaning them for a coin collection, DON'T! They will lose value if they have been handled or cleaned.