I, too, am one of the hot water and RETAYNE users for prewashing fabrics. I wash all the fabrics for the quilt together so that if there are any bleeding fabrics, the RETAYNE will hopefully have taken care of it and the rest are pretreated/preshrunk at the same time. Haven't had any problems so far and have done that procedure for many years. I also include "Launder in COOL water only" on the label cuz that's what the bottle says!!! Before I started piecing quilts, I was a garment sewer (for myself and four children) and learned to prewash fabrics before cutting. I couldn't imagine sewing a garment and only getting to wear it until it was laundered because it then shrunk. Alisonquilts, am sorry of your aggravation. That massive shrinkage would be so disheartening. Thanks for sharing.