+1 on white vinegar. Regardless of what it is - cycling gear, running gear, working in the yard gear - I'll run the wash with vinegar first, then run again with detergent. The acid in the vinegar will not only help kill stuff, but it will also strip away some of the buildup from too much detergent, which is basic. If stuff's really bad, soaking the clothes in a bucket of water with a cup of detergent overnight works wonders. And yeah, I sweat a lot on humid days...