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3 Ways to Remove Mildew Smell from Towels - wikiHow
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.
How to freshen your towels and get rid of that mildew stink #springcleaning