OK, so I see basically that you're suggesting mild detergents (it looks like Synthrapol is a detergent with some dye removing properties). So I took some mild liquid hand soap and tried it on a spot and the line was slightly reduced. Then I tried some of the clorox stain removing pen, and it also worked slightly. I'm thinking now that it might go away when I launder the quilt--I'm still quilting it. Do you think it would be reasonable to try the stain removing pen along the whole line and then launder it, like I do with other types of stains on clothing? Would I still be able to use Synthrapol later on if that didn't work?