My teenage son plays soccer and his clothes are always stinky, especially under the arm pits. My husband's towels can have that body odor smell, too. Here is the solution that works for me. 1 cup vinegar, 2 tablespoons baking soda, regular laundry detergent in hot water rigorous machine cycle. Do not pour the vinegar and baking soda directly on your clothes because it may splotch your clothes. I was told that the stinky smell is bacteria and can become worst if you leave the clothing for days. Obviously, do not wash the stinky clothes with other clothes because the bacteria can spread and the stink can contaminate. You athletic mom's can thank me later. :)
Donna