S.C.
Hair spray, an old toothbrush and cold water. Soak the area with hairspray, let it set for a minute or so, scrub a little with the toothbrush, rinse and repeat until the ink is out, then wash. If you put it straight in the wash without getting out the spot then the temp you use may help se the stain. Putting it in the dryer befre it's all out will do the same.
Good luck - S.