I think I found the answer to mildew/sour/vinegar sweat smell! After a year or two, and much experimentation, I realized my sweat didn't smell so much like mildew as vinegar. When I searched this our, I found one site that said its your pH balance being off - not so uncommon - and the solution was 1/8th teaspoon of baking soda in a glass of water for 2-3 weeks - mine went away after 3 days! Try it, it's such an easily solution for such an embarrassing and seemingly difficult problem!