I am having this issue as well, mainly due to the recent temps.
I sweat so freaking much when I run in 103 degrees, it just won't come out. The weird thing is that I do not stink when I am done running, nor do my clothes, but the clothes come out of the washer stinking after they have been laundered.
I got some color safe bleach that I am going to try. My wife says it might help.
The worst part is that the other morning I went to a Habitat 4 Humanity build and wore one of my running shirts. 5 minutes into the build I began to sweat and the shirt just started reeking. I had another tshirt in the car that I switched into and was fine.
This only happens to me in the really, really hot months.
BTW, they also make a runner-specific clothing detergent but it does not help with this problem, nor does OxyClean.