K.N.
Believe it or not, hairspray really works on ink stains. Put a paper towel on the inside of the garment, spray the ink with hairspray & blot with a second paper towel. Do it again if you need to. Wash in cold water & line dry (the heat from the dryer will set in any ink left over, making it harder to remove). You might have to do it a couple of times, but usually it comes out first try. Works like a champ! I've done it with pen marks from black, blue and red inks.
Good luck...