Thanks to everyone for the good suggestions and the support. I did everything suggested and ordered the marking pencil remover. After three washings and hard scrubbings with bleach, it started to fade but is still noticable. I attached a picture but you can barely see it. I think what happened is that I didn't move quick enough with my FMQ and the stitches got squished and caught the graphite tightly inside them. First effort, oh well. So, I will quilt some decorative vine patterns to cover the remaining marks. I should have hand quilted it!!!