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I have had good success in the past using a 5 gallon bucket full of warm water and laundry detergent and doing the old fashioned hand-wash treatment. I rub the belt back and forth on itself as we'll as using a stiff brush to break up any surface crud. Depending upon how bad the belts are soiled I may have to replace the water a couple of times. I always rinse in clean warm water and then let them dry in the sun to minimize rusting inside the buckle. Make sure you move the buckle down the belt as well to get that spot that is inside or you will have a dark dirty spot after you are all done. Good luck.