I very rarely prewash, but, if I have any question, I test a small piece. I haven't yet had any issues. I don't have any allergies to worry about. I like the way a quilt looks after it has gone through the washer and dryer. I use cotton batting to help it get that vintage look. In my case, I think the lint is related to some threads, although I started a project using something called "Eclipse" black fabric from my local quilt shop where I think the fabrics are good quality. This is the black they keep in stock. This fabric leaves dust! I end up with it under my fingernails! I am half way through Leah Day's Friendship Quilt along and don't want to change background fabrics midstream.