If you have a non-stick raclette, then it is very easy to hand wash with soap and water and a non-abrasive scrubber. For a granite grill, if you have dried on burnt bits to get rid of, use a stainless steel board scraper first. You can soak the top in vinegar and baking soda before scrubbing with soap and water for regular dried on food. Don't worry if the top starts looking stained because it is a natural stone that will look aged after a few uses. The high temperature of a raclette stone kills all germs anyway.