Got a problem. My gym shirts are starting to build up a funk from so much gym time.
Normal laundry doesn't seem to cut it. I usually hang my shirts up to dry, then run them in the wash. Tried using more detergent (up to twice the normal amount) and even running multiple cycles, but I can't seem to kill the smell.

Any tips? What kind of detergent would be best? New shirts aren't too expensive, but I like what I have.