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My gym shirt starts to smell once I start to sweat. What's the fix?

We bet your gym shirt is made with wicking fabric that's "hydrophobic".  The thing is, this material is good for staying dry at the gym but bad because it gives you BO, says Kay Obendorf, PhD, a professor of fibre science at Cornell University. "The oils in your sweat are also hydrophobic, and they're much harder to remove from another hydrophobic surface than from something that absorbs water, like cotton or wool. " That would be fine, except that your skin's oils contains lipids, cholesterol, fatty acids and ammonia -- a veritable buffet for stink-producing bacteria. If you really want to try to save that smelly rag, Obendorf recommeds using the longest, hottest wash cycle the fabric can take (check the label), along with bacteria-killing detergent.