if you're talking about those clad zincolns that have a crust harder than steel, I tumble them in a cheap stone tumbler with a little dish detergent and a small amount of aquarium stones.
Any thing with any value, silver, early nickels, coppers, you should do what pls stated.
Good luck.
Any thing with any value, silver, early nickels, coppers, you should do what pls stated.
Good luck.



















