All suggestions were very much appreciated. Thankyou everyone!
After some additional research and fretting, I decided the laudromat limitation
was just too difficult, so I took the fabric to my favorite drycleaners and
explained the problem. I cost me $10 (I think they charged me as if it were a
tablecloth) and my fabric was ready and pristine white when I picked it up
after work. While the $10 seemed a little steep, it was worth it since I didn't
have to spend any more time in a laundromat and could start sewing that evening!
So I just washed my new purchased 6 yards of white cotton/poly target at my local laundromat.
Sadly, my dryer of choice seems to have been contaminated with either black eye-liner or crayon and now my white target is covered with tiny black streaks.
There are hundreds of these little smears! Does anyone have a washer-based solution for removing makeup or crayon from white fabric? I think I sweet-talked a free wash tomorrow morning, but I don't think just-detergent is going to do the trick. :( Any ideas?
Nobody can make you feel inferior without your permission.
-- Eleanor Roosevelt, diplomat, author, and lecturer (1884-1962)