I never wash any of my fabrics before using them in a quilt, but have never done a quilt that has high contrast...red/white...either. In my life, the need for washing would just add another stumbling block to getting started on a project! I normally use good yardage from our LQS which sells high quality fabric. I always wash my quilts when they are finished and ready to gift, and always use color catchers. No problems!