I always prewash all of my fabrics to memove chemicals and very seldom wash a funished quilt we don't smoke or have pets so no problem there but I never really wash my quilts as they do not get dirty I soak them in warm water with orvis soap then spin the water out of them do the same with the rinse water then maybe just a short time in the dryer on fluff then lay them flat until they are dry I was given this method years ago and my 25 and 30 year old quilts still look new