I always prewash all my fabrics. I always wash in cold water, dry on regular heat. I dry large yardage of fabric by itself, fold over a ruler, smoothing as I go. I seldom do any pressing until I have pieces to press. I never starch anything. I would never wash batting. I mostly use hi loft poly batting. When quilts are finished I wash and dry again. I have made about 300 quilts. No problems.