To eliminate mold and mildew in your dishwasher, spray the intricate parts of your dishwasher where moisture can linger long after a cycle is complete - in the pleats of rubber seals, traps, and crevices of the utensil basket.Ī 2016 study of residential dishwashers found that 83 percent of the dishwashers they tested were positive for fungi, and 47 percent of dishwashers tested contained the black yeast E.