How do I clean the inside of my WFW9400SW00 washing machine?
Use the Clean Washer cycle once a month to keep the inside fresh and clean. Open the washer door and remove any items, then add 3/4 cup (160 mL) of liquid chlorine bleach to the bleach compartment—do not add detergent. Select the CLEAN WASHER cycle and press START. Allow the cycle to complete (approximately 50 minutes) without interruption, then leave the door open slightly for better ventilation and drying.
From the official Whirlpool WFW9400SW00 Washing Machine manual, page 19
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