I have used hairspray(sometimes it requires several applications), peroxide, or Simple Green(they sell it at Wal-Mart, Home Depot, Lowe's etc). If you go to a uniform store, they have special stuff there that will remove ink stains too. I have a co-worker who put a pair of white nurse's unifrom pants in the dry with a permanent red marker and the cap came off and the pants came out with red streaks all over them. She purchased this stuff at the uniform store, washed the pants once, and it all came out.