20″ bread board. Clean by simply washing it with hot soapy water after each use and dry it with a clean paper towel or let it air dry. Do not soak or submerge the board in water, for this will disrupt the moisture content and cause the rails to split. Wood cutting boards are NOT dishwasher safe. It is extremely important to give your cutting board a good oiling on all surfaces every 3 to 4 weeks.