Pick up gallon of dishwasher scale remover at you local restaurant supply house. Dilute according to instructions and then add or subtract according to need. A 5 gal. pail works well, especially with lid - solution can be stored and reused. I have a smaller bucket with drain holes drilled in the bottom - just load, soak, rinse and dry. I do this with all of my
coins. They seem to count easier and keep the
changer hoppers cleaner. Don't know if the customers notice, but it it makes me feel better.