Ok, seriously now. What REALLY is the best way to clean coins????

I've cleaned pennies with automotive wheel cleaner. I put some in a jar with some pennies and let them soak for a few minutes and then rinsed them with water.
 
I tumble my clad coins. Pennies tumble together and I tumble my nickels, dimes, quarters together. Cleans them OKAY... I use white aquarium gravel and a little soapy water. Heavily encrusted coins take forever, but I clean for about 30 minutes to an hour depending on the make up of the coin.

Pennies turn out okay, some get shinier than others. Most of the coins I find here are so stained with the red clay that there is no turning them back into normal looking coins without polishing them with a dremel. Not worth it for clad in my opinion.
 
cleaning coins

I've been cleaning brass shells for years in a bullet tumbler. Get the Lyman turbo 1200. Add corn media and a little brass polish (Midway shooting Supplies). That system works great on steel and brass shells. It should work on coins and relics.
 
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