Tip - Getting out the Musty, Mildew Smell of Towels >> I did this in the opposite order, since the towels were already soaking in borax & detergent when I read this -- just added a cup of white V to the whole load. we'll see how it worked.
How Do I Get the Sour Smell Out of Towels Once They Have Dried?
Wash Towels in HOT water & a cup of Vinegar. Run again in HOT water with a half-cup of baking soda. That will strip your towels from all of that residue & mildew smell & will actually leave them feeling fluffy & smelling fresh.
Using the hottest water cycle on your washing machine, wash your towels with a cup of vinegar. When cycle is complete, leave the towels in the washing machine and run through another hot water cycle, this time adding a cup of baking soda.