Update
 

Thanks for all the help and support. I guess I had my first quilting crisis - had to happen. I also raise orchids and the saying is you aren't an orchid hobbyist until you have killed 100 orchids!

I will run out and get some oxyclean for next time. What an ordeal! I scrubbed it threes times - finally with bleach and it lightened but you can still see the marks so I'll just have to embroider some vines on it. Can't subject it to any more washing or I'll destroy the silk ribbon. For picture, see posting above "Washable graphite pencil...Update"

I had a pink chalk that wouldn't come out. I sprayed it with Shout washed with a little oxyclean and it was gone. I had washed and dried it 2x previous to this . I have used Shout for years to take out pencil marks also. But never with silk ribbon. I also soak vintage blocks in oxyclean to get out old stains. So far its worked pretty well.

I use FriXion pens. I first learned about them from a video on Missouri Star Quilt Company but you can get them at Staples also. You use the pen and then iron the marks after you've sewn. Try it on scraps first. I'm really sorry you're going through what you are for your current problem, and I can't help you there, but I'm sure others on the board will come up with some answers. How exasperating after all the work you put into it.

I had this happen and used a product called Restoration (it's a powder used to restore old linens, etc). I soaked the quilt in it in the bathtub for several hours and then washed it. Worked for me. Good Luck!!!!

Word of Caution
Frixion Erasable Gel Pen ~ for marking quilts?

http://www.sewstitchcreate.com/2011/...arking-quilts/

I did a test...
marked fabric
ironed~ink gone
put in freezer~ink returned
washed fabric~ink gone
dried fabric~ink gone
put in freezer~ink DID NOT RETURN
let thaw~re-ironed

the ink was gone after I washed the fabric.

I recently discovered that a Tide-to-Go stick removed No.2 lead pencil marking on a white quilt square. Might be a bit tedious for a whole top but can't hurt to test it on your particular fabric. Lots of good suggestions here so far too. Good luck!

Try using Dawn dishwahing liquid or Oxiclean with your soap.

Don't know if it would work on the quilt, but when I was a child and got permant ink on my clothes, my Mother would soak them in milk and it took it out every time. It was raw milk.

We will wait to see what worked for you and good luck!