[header] How to clean coins [title] Hold the coin under warm water. [step] Doing this will allow your faucet to remove initial dirt buildup. The faucet should be enough water pressure to get the job done, so avoid any add-on to increase the pressure, like a jet. 
You only need to hold the coin under the faucet for one or two minutes. Once you are done place them aside on a paper towel or rag.