Ok, got the borax. Got the ammonia, and the gravel. (Although the local crushed rock still turned my coins grey and had to buy the aquarium gravel) Got Dawn dish soap. Got CLEAN coins, Woo Who! Now, I've got a bunch of dirty modern dollar coins - Sacagawea - presidential series... Do I clean those with the pennies or the clad? According to the US mint it is copper core with manganese brass finish coating. So, they're all black right now and never enough to tumble alone. I accidentally included a James Madison dollar with a pile of clad and it seems ok - can't remember how worn it was before hand because I didn't realize it was mixed in, but does now have signs of wear. Any suggestions?