I am the proud owner of a bunch of used prefolds that were used as burpees and most likely washed with soaps with brighteners and dried with dryer sheets, etc. I ran some water on them and it runs right off rather than absorbing. Is there any hope for them? If I wash them several times in hot water, maybe some bleach and good (diaper friendly) detergent, will their absorbency come back? Any other tips?