Okay, so I have never prewashed fabrics bought at a store, but have always washed fabric finds from garage sales or thrift shops. For those that do prewash, do you wash each fabric separately or do you wash similar colors together? Do you run a full wash or do a quick wash? I do ALWAYS wash a quilt as soon as it's finished as I'm not going to give away a quilt only to find out later that it fell apart or bled when the person I gave it to washed it. May have to consider prewashing though as I've noticed my hands have been starting to itch when touching fabrics in quilt shops lately.