I used Sterlings Magic cleaner and a worn soft toothbrush. I put a liberal amount of the pink cleaning gel on the toothbrush and scrubbed one side of the chip, then the other of the chip, and then I cleaned the edge. The chip was then washed in warm water to remove the excess cleaner and towel dried. The whole thing took about 2 minutes. For a lightly soiled chip, I use much less cleaner and then I don't have to wash the chip in water to remove the excess cleaner.