I do.....and I don't!!!!! I pre-wash everything EXCEPT flannel that I'm going to use fot Ragg Quilts. It just doesn't fray as well if it has been fray checked. The second thing I do is treat the cut edges with Dritz Fray Check. I let it dry thoroughly, & then wash in a homemade mixture of Fels Naptha Soap, 2o Mule Team Borax, & Arm & Hammer Washing Soda. This leaves the fabric nice & soft, & free of all sizing & odors..