You have several choices: a silver cleaning rag, a bottle of silver cleaner from Walmart, or go online and order silvercleaner tray to put your silver in.
Most likely the item in question is silver plated or just silver colored. Items that do not display sterling markings are non-silver 99 times out of 100.Visit the link below to learn more about...
Silver polish and a lot of rubbing.
Sometimes you can put a little TSP in a glass or plastic bowl (not metal), add a sheet of aluminum foil then put a couple pieces of silver on top, in direct...
Both are silver plated, but silver on copper tells you what kind of metal is used as an underlay. Silver plated copper is more valuable than silver on a white metal or zinc underlay.
Cleaning coins is not a good idea, it will damage the coins and lower or destroy the collectible value. Please consult a dealer or collector before the coin are cleaned.