How to Clean Old Japanese Coins

Fill the first plastic container with 1 tsp of dish liquid and warm water. The warm water should be filled to the brim (top) of the container. This first container will be the cleaning solution for the coins. The dish detergent is a mild cleanser that will remove the residue from the coin.

Fill the second container with warm water only. This container will be the rinsing container that will remove detergent residue and dirt. The water in this container should not be too warm, room temperature will suffice.

Dip a coin into the detergent solution for just 5 seconds and remove it. Do not dip more than one coin at once. You will only risk scratching the coins and depreciating their value. You should also rub the coin as you are dipping it to encourage dirt removal.

Place the coin next into the plain water container to rinse. It is not necessary to rub with your fingers unless debris remains. You may agitate the coin in the water, if loose dirt sticks to the coin. Rubbing dirt grains can cause scratches.

Lay the coins flat on a towel to dry. After ten minutes or so the coins can be handled and put in protective casing. Do not rub the coin with the towel, no matter what. This action may damage the delicate coin. If all directions are followed correctly the coin shall be clean.