If you have obvious belt marks or build up, clean the ball first with your favorite cleaner. The dishwasher is mainly used as a heat source to remove the oil, not as a surface cleaner. Run it through a normal cycle, not just the rinse cycle. I usually do the heavy duty cycle because it's longer. No matter what, turn off the heat dry cycle, but leave the ball in until the dishwasher is completely done. Some probably don't, but I use a small amount of the dishwashing soap. Just don't use anything with a "drying aid" built in.