Vinegar as some people suggested helps. For me, the only thing that got the stink out of my gym stuff was adding Borax to the wash. Did wonders. If you have a washer at your place, try starting a load, let it agitate for a little bit, then pause it until the next day. Also, hanging in the sun and wind helps. But if you only do one, buy some Borax and add it to your load next time. Should make a huge difference.