Affresh cleans deep inside your machine's tub, racks, pump, valves, drain and recirculation hoses. Affresh dishwasher cleaner can be used with a load of dishes or alone. See the next step for how to use your dishwasher cleaner with a load of dishes. 1. Place one tablet in the detergent tray. If significant buildup is noticeable, a second tablet can be placed in the bottom of the dishwasher.