G.I.
I actually have 2 suggestions. The first is to put oxyclean in the bottom of the washer & let it fill with a bit of water before putting in the clothes (I've used it and it's gotten out everything but chili & spaghetti sauce). The other, my aunt swears by it, you put hairspray on it & let the hairspray dry then apply more and throw it in the wash. She's seen it get out everything including pen.