I clean many chips using just a toothbrush and liquid soap. The only cavaet is to be very carefull with hot stamps and old, very worn chips. The HS may disappear and the old chips will look worse since all of the detail is worn off and the dirt helps show what is left. Chipcos and BJ chips are indestructible and always look better clean. Most inlaid roulettes are also easy to clean and most need it badly.