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Before you make an attempt to clean your coins, makesure that you check whether or not the coin is valuable. If the coin is very old or valuable, check with a local coin dealer before attempting to clean it, as improper cleaning will negatively impact its value.Begin by washing the coin under cold water for about a minute . The higher the water pressure, the better. In order to protect the face of the coin, hold the coin by the edge, as touching the face of the coin can cause small scratches.If the coin is still tarnished or is dirt or rust remains, soak the coin in vinegar for a few minutes. If the coin is gold, hot soapy water works the best. For old pennies, soak the coin in vinegar for at least twenty four hours. Bronze coins can be best cleaned by soaking them in distilled water. The minerals in plain water can damage the coin. A gentle way to clean coins is to soak them in olive oil, although you usually have to soak the coin for several weeks. A soaking in lemon juice can also clean and brighten silver coins. After this, rinse the coin again, and then pat the coin dry with a lint free cloth and lay on a cloth to finish drying. Never wipe a coin dry.