I won't use my washer machine,,I wash them in a tub of water with a box of baking soda,,wash let sit in for 5,min or so then hang in blue spruce pines in my back yard for a week or so,,
Then I have several coolers that are washed out with baking soda too,,I fold and stuff warmer weather in one cooler and colder weather in another,the coolers seal and the tubs (unless they come with a built in seal),, don't,,
I beleive there is still some garbage left over even after you wash without anything in your washer machine,,I've servised several of my own with pump changes,motor changes and belt service too,,I always see left over residue in some of pump parts and the center for the softener usually will always carry some too. Plus I found the colors last longer like this too,,Jason B.