I don't prewash and have washed my quilts later...not right after. Mine are fine. I really like the older looking quilts so this works:0). I don't worry about the chemicals in the fabric either. Maybe I should but, I figure between my carpets, furniture, cleaning supplies and what he leaves in the garage and what is inside my car...a quilt won't matter:))LOL
Just recently I used some Rit dye to tone down a panel and rinsed good, and dried..then I had to fight w/my iron and talk to the panel to get it in a square again....so, for me, never again!:))Skeat