How do I run the Clean Washer cycle to maintain my washer?
Run the Clean Washer cycle once a month by adding 3/4 cup (160 mL) of liquid chlorine bleach to the bleach compartment of the dispenser drawer — do not add detergent. Select the CLEAN WASHER cycle, press START, and allow the approximately 50-minute cycle to complete without interruption with an empty wash drum. After the cycle is complete, leave the door slightly open to allow the washer interior to ventilate and dry. (Page 20)
From the official Whirlpool WFW9400SW00 Washing Machine manual, page 20
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