An inkpen 'exploded' in my son's Ref. soccer uniform pocket and there were a few more 'blots on other parts of the shirt. (He forgot to tell me - I found it in the dryer) I remembered an old treatment I had heard about but never used:
1.) Dampen the area. 2.) Spray the area with hair spray!
3.) Pour a little dishsoap on the area 4.) Add a capful of white vinegar 5.) Blot it with a paper towel 6.) Let it sit for 30 minutes. 7.) Scrub w/a small brush (You may need to repeat this process.)
I did this process 3 times then washed it in a regular load again. My son's shirt is wearable, but I think it would have all come out if I'd known BEFORE it went in the dryer and the stain 'set'.