It's a good thing you searched for "how to clean silver coins" before you got started. If you have valuable silver coins, you actually shouldn't clean them at all. While silver coins can tarnish or pick up dirt, minerals or other residue, they are often best left as is. In fact, some rare coin collectors prefer the authentic look of a little wear and tear. If in doubt, talk to an expert to see if your coins are valuable. If you have "junk silver" coins (circulated 90% silver coins whose only value is in their bullion content), cleaning those is generally okay. Here's how to clean silver coins.
Prepare a bucket or shallow dish with warm, soapy distilled water.
Use a soft toothbrush to remove loose dirt.
Rinse coins gently in water.
Dry coins with soft towel.