Why Home Washers Fail At This
A comforter needs room to tumble so water and detergent can pass through the fill. Stuffed into a home drum it becomes a dense wad, the detergent never rinses out fully, and the fill migrates. Then the home dryer cannot get the core dry, which is how you get a musty comforter. Commercial machines solve both problems with drum volume and airflow, not with anything exotic.
