If you still have the packaging or name of the manufacturer I would look them up on the internet and contact them via e-mail to see what they suggest for removing the marker. I'm sure they have received messages from others with the same situation and probably have the best solution. Good Luck.
Originally Posted by
ankegram
OMG! I think I'm going to have a heart attack! I just finished a queen size, hand quilted wedding quilt for my son and his bride. It took me over 6 months! It really turned out beautiful, BUT, I can not get the blue chalk lines out. I always wash my quilts before giving them away, and the quilting lines have always washed right out. Not this time! I used a "Blue washout Pencil." I have it in the washer right now for the second time. This time I used detergent and Oxyclean. Any suggestions? I'm really worried! 
Thanks for any help you can give me.