I prewash everything except fabric for stack n whack and One Block Wonder quilts but must say I've never had anything bleed (except one or two batiks)or shrink noticeabley. I hardly buy charms or jelly rolls but wouldn't prewash those... so why do I prewash my regular fabric? Dunno! I LIKE doing it then pressing it all nice and flat then folding it neatly away into my stash! Plus sometimes it smells of that formaldehyde type stuff and I don't like that. :mrgreen: :D