I think your mistake was using warm water, then hot. You most likely set those pre-printed lines with the heat from the water. Heat sets them! This is why you need to be careful exposing them to heat and never, ever iron. Some detergents set them too. Always, always wash preprinted panels (such as whole cloths, etc) and anything you marked with blue water soluble marker in COLD water with NO detergent. 9 times out of 10 that gets everything out. So sorry about learning this lesson the hard way.
Edited to add, what kind of batting did you use? Very close stitching plus warm and Natural batting does make for a stiffer quilt. But dense quilting done with other battings such as Hobbs wool, Hobb's heirloom, Hobbs polydown does not. Quilter's dream tends to not stiffen up either. W&N does tend to get stiff with dense quilting, as does not traditional battings like a wool blanket.
Last edited by feline fanatic; 11-12-2013 at 06:46 AM.