Cleaning coins in a rock tumbler?

I heard that letting a train run over your coins will clean them very well and it don't even cost nuttin'!

Be careful doing this in Europe though cause it is very difficult to hear the electric trains that are moving at 150 - 200 MPH. You might end up cleaning your clock and your coins!!

 

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It IS a good idea.........for cleaning up dirty corrodid coins that you want to be able to spend but a very bad idea for anything you think might have better than face value.
If I didn't tumble the clad the bank and stores wouldn't accept take it.
I don't know about the fun part but I tumble and cash several hundred dollars in Junk every year.