I have never pre-washed and have been quilting over 20 years. Just lucky?? I also like the crinkles that make it look older on some. I did several Batiks, as this is my favorite fabric and no runs. Maybe using cold water helps . Now I am a little leary. Might try washing. Do you wash each fabric by itself? I would have to start with new fabrics I get. My stash in three walls in my sewing room with full shelves of fabric. I guess I could pre-wash as I pick fabric for projects. I might try the "balls" that absorb colors too. Great ideas ladies.