Sand blast them.
beekeep
>I have some 1921 silver dollars and some indian head cents my mom saved
>from the 20's. how can I clean these ? They were is an old black baking
>soda can under a floor I ripped up in the house my grand dad owned.
>Jerry
>
>
ultrasound cleaner is about the only method I know of the won't
de-value them
Could be you have a rare baking soda can there. Sorry about the floor.
What's on the dollar coins that you'd like to remove?
If your intent is to sell the dollar coins, I would suggest leaving them
just as they are. Any potential buyer interested in them for reasons beyond
their silver value might be smitten by the possibility of a "diamond in the
rough". If you "clean" them, the mystery disappears.
As for the common coppers, either keep them as novelties or put them up as a
lot on eBay and hope for the best. Don't try to "clean" these either.