I usually wash flannel before because of the shrinkage but when makomg a rag quilt don't. It will rag much quicker without prewashing. Be sure to check your thingy (can't think of what it is called) on your dryer that catches lint several times because there will be alot and could be a potential fire hazard. I have taught this class a number of times and always give these instructions. Please post a picture when done. Winter is coming (hard to beleive) and my rag quilt is my favorite for keeping warm. I purposely made it under 72" so my husband (6'4") wouldn't steal it from me. (Evil laugh)/