Wash your towels in hot water with a cup of vinegar, and then run again in hot water with a half-cup of baking soda. That will strip your towels from all of that residue and mildew smell and will actually leave them feeling fluffy and smelling fresh. ***Do not add laundry detergent to either wash. Just once with vinegar and once with baking soda. *** This trick also works well with wet bathing suits that were left to dry.
Wash towels in Hot water and one cup of vinegar, then run a second time with 1/2 cup of baking soda. Do not add detergent. Leaves towels fresh and fluffy. Can also be used for bathing suits. I'm going to try it on my tee shirts that sat in the washer over night and smell bad after I wear them a few hours.