I never used to wash my fabrics (back in the 70's) because basically, I started with baby quilts and scrap quilts. After having a purple fabric bleed on a block I was making, I started washing everything as I bring it in the house. I wash it with a regular load, regular liquid soap, regular temps, etc. with the exception of small pieces, fat quarters, etc. which I put in a mesh bag. I've also discovered that if I wash fabric on my delicate cycle, it hardly frays at all. If I take it out of the dryer promptly and fold it right away, it usually doesn't require pressing. If it does, I press it before I cut. At one time, I pressed all my fabric as I washed it, but after buying a huge box of fabric, I realized I would be ironing for days so that's when I decided to iron before I cut a piece.