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I did not like my dirty, sticky coins. So, I use a rock tumbler to clean pre-1965 US junk silver. The results are spectacular.
1 1/2 lb Stainless steel shot
$30 Face
Water to cover shot
Drop of dish soap
Don't use Tarn-X, it will yellow and make coins sticky. But you can re-tumble to reverse the effects.
I change the water every few hours, but it doesn't seem vital. You can tumble overnight with fantastic results.
Results:
1 hour. Coins are very clean, but not perfect. 85% clean
4 hours: 95% clean.
8 hours: 99% clean. Proof-like finish.