I remember the one on the combination washer dryers that Whirlpool made were extremely helpful in getting the load real clean and thoroughly rinsed.ours had a concentrated "Super wash' that would begin using less water which would concentrate the detergent (Dash) and then,more water would come in to continue the normal 12 minute wash.I would take my gym outfit home every Friday and it was so clean that my fellow students would pay me $2 to take theirs and have it washed in our combo!! The phys ed teacher thought I had a scam going and stopped us from doing it after seeing me get $20 from 10 guys together.Oh how I miss that great unit.I see no justifiable reason for the current manufacturers to not have these come back in to production.especially since those who made the original ones are,in most cases today, now merged together, and could make a fantastic, efficient, well constructed combo.