Things You'll Need
Instructions
Make a mixture of warm water mixed with dishwashing detergent; make enough to submerge the coins in. You can also sprinkle a sparse amount of baking soda in the water. Do not use harsh chemicals like ammonia, lemon juice or vinegar.
Let the coins sit in the water for five to 10 minutes. Examine the scratches. If they still appear harsh, soak the coins for five to 10 more minutes, then remove the coins from the water. Allow the coins to air dry or gently pat them with a soft towel. Do not rub the coins with a paper towel or rag, because this will scratch the surface.
Use a new toothbrush to remove ground-in dirt. Tap the toothbrush on the surface of each coin. Do not scrub the coins, as this could cause light scratches in the surface, which will depreciate the coins' value. Rinse the coins in fresh water and pat dry.