I am very religious about pre washing my fabrics. When I started quilting that was what I was taught but now more people are not pre washing thier fabrics at all.
I wash mine before using them or putting them into my stash. In classes I cough and sneeze if I sit close to someone who hasn't washed their fabric.
So do you pre wash or not? If not may I ask why? One reason I hear is because unwashed fabric feels nicer to some folks. my reason is that I put alot of money and effort into my projects and sure would not want unwashed fabric to impact it down the line.