Iam so sorry this has happened to you...but we learn from our mistakes....if it were me I think I would NOT put anymore stress on the quilt using agents to remove the stain.....I would definitely do a decorative stitch over the lines that are showing...it may be a little more work but think about the look afterwards...good luck to you because I have put this mistake in my quilting book for what NOT to do when making a quilt......Trish