My wife suggested that we add Fabreeze to the wash and it does wonders for getting sweaty stinky cloths smelling neutral. I have a front loader machine. I add the fabreeze where the bleach normally goes, and run it as if it is a white load. Don't use fabric softner on the breathable shirts (check the care lable) most don't allow the use of it as it interferes with the wicking of the fabric.

Happy riding,
André