Does anyone know how to clean old dirty coins?

Cleaning coins damages them. Go ahead and try what these other clowns are telling you to do, you've already ruined any value they might have had if you left them alone. Collectors will not buy cleaned coins. An old coin that's had its patina stripped off will never look new. It might look shiny for awhile, but it's not a natural, attractive look.

First thing to know is do not clean "key date" coins it will diminish their value. If you have coins that are not key dates and have silver content (40%) and you must clean them, you can use warm water and baking soda. Just rub the coin with the baking soda and water between your fingers then rinse.

Another way is to tumble them in a tumbler, you can get a Harbor Freight tumbler for about $39. Put 1/3 aquarium rocks and a handful of coins along with a couple drops of dish soap and a teaspoon of baking soda and tumble for 2 hours. You'll be amazed at how shiny they come out.

Yes it is a way to clean old dirty coins is by science

STEP 1 :- Put the coins in Vinegar for 4 hours

STEP 2 :- Voila!!!! The coins are looking very clean coins

That's how to do it

Believe it or not, Coke Cola works too. Now think about what it does to your stomach.. Mmmm