C.S.
I had this happen to some of my clothing one time. I just tried re-washing them BEFORE drying (once you dry, the heat will set it in) and in my washer, I added about a 1/2 cup of clorox bleach to the water, let the cycle mix up a little bit BEFORE I added my clothes so it wouldn't get bleach stains, and when I got them out of the washer after the cycle, it had come out. However, I did NOT dry them before re-washing them. Hope this helps! Good luck!