- Using baking soda helps. Pre-soak your clothes in a solution of water and Arm and Hammer Super Washing Soda (or just use water and a cup of baking soda). You can use the pre-soak setting on the washing machine or do it in a separate container. Then wash and use Arm and Hammer laundry detergent.
- Try using a special detergent formulated for technical wear, such as WIN High Performance Sport Detergent. Those types of detergents will remove the odor, but won't degrade sweat-wicking or water-repellent properties.
- Plain white vinegar is an inexpensive and cheap odor remover. Soak your running clothes in a cup or two of vinegar mixed with plain water. Then wash as usual. Or, pour 1/4 to 1/2 cup of white vinegar into the wash (along with your regular detergent).
There are also lots of new odor-fighting running clothes on the market. They may sound too good to be true, but these running clothes do actually help keep you dry and odor-free. Although some of them are more expensive than your average running shirts, they're worth the investment because they'll last longer and keep you smelling fresh.