Rubbing the dirt off of silver coins can leave scratches and greatly decrease its value and appearance. I used to take my silver coins home dirty and run them under water. When i started The Hoover Boys Metal Detecting YouTube Channel i wanted a solution to clean my silver coins in the field. This way i could reveal the coins details, date, and mint mark on site. So i would carry a small spray bottle of water with me. One day I called it Foo-Foo Juice and the name just stuck. To be funny i slapped a Foo-Foo sticker on my bottle. Foo-Foo Juice was born. Fill with your choice of cleaning liquid. We use water.