Oh Wow, stunning.

I have removed several tough stains from various pieces of clothing by using OxiClean granules. It has never discolored or damaged any of the fabrics. I wet the stain, cover it with the granules, add a little more water, and rub the granules/water area with my finger. I have rolled up the piece of clothing so the granules/water don't dry out. I usually leave it for a day and then check it. Usually the stain is gone; on a few occasions, I added more granules and water, rolled it up and left it another day. Rather than roll up the quilt, you could just put a wet crumpled cloth on top to keep it moist. The only thing I have been unable to remove is soy and teriyaki sauce. Recently I looked online how to remove soy sauce and it mentioned vinegar and it also suggested peroxide, so maybe you can find info online if the OxiClean doesn't work. Good Luck

I read somewhere but have not tried it yet - the Mr. Clean eraser works great - takes everything out. I hope this works for you. Let us know. It also cleans up those dirty yucky white outdoor chairs, then you are to put furniture polish on them.
I must buy some Mr. Clean Erasers. Hubby put new spigots in the kitchen and I could not find any in that mess under the kitchen sink! Must put them on my list since he does the shopping. Good luck.

wow, that is beautiful work.