Nikwax Down Wash 10 fl. oz. Down Wash (10 fl. oz.) - Down Wash cleans and restores the loft and natural water-repellency of down garments and sleeping bags. It effectively cleans heavily soiled down-filled equipment. Down Wash preserves the water-repellency of outer fabrics as well as the down itself. It helps the down and feathers regain their "bounce" and loft. For maximum effectiveness, use a large capacity commercial, front-loading machine.