I don't pre-wash my fabrics. I wash my quilt tops before I hand-quilt them. The reason is that I shop for fabric every 3 months and I always buy 3 yards of each selection. I spend around $300 to restock cause I sell my quilts. I also buy my white and cream by the bolt. I don't have the time to wash and iron that much fabric. I shop at only 2 places and I have never found anything other than fabric in my bags. Maybe I've just been lucky.