up the creek

[Digger_O'Dell]

Or an old cell phone charger , cut the plug that goes into the phone and attach alligator clips to both wires , now you have a simple tool for electrolysis. I use that method when I want to clean a coin from the water. The crud bubbles right off ..

That's another effective method, but you have to be careful. Too much and it can pit the silver. Use the wrong polarity and is will actually bond impurities to the silver (electroplating!)