This is the best method of cleaning old copper coins that have been found buried in the ground while metal detecting, in my opinion. Many Youtubers immediately spray old colonial coppers and large cents that they dig with water and scrub the dirt and mud off of them with a toothbrush. I believe this to be a mistake, although I do understand the desire to immediately try to clean a coin for quick identification. In this video, I describe and show why should never do that if you want the best oppo

How to Clean Coins