I don't like to prewash my fabric. Why? Because I use the Warm Company batting (I'm a seller of this batting; check my store). I like the antique look of my quilt once it is washed. But, oh Joey, what about if your fabric bleeds like using red!! I have a solution for that!! I use "Shout Color Catcher"!! It has been a lifesavor! One of the RQQ members told me about it and it truely works!!
Did you try prewashing your fabrics? Yes, I did. It's time consuming and plus you would have to iron the fabric!!! Why, don't you iron your fabric? Yes, I do! I actually use stream while ironing my fabrics. So the stream actually shrinks the fabric. I've not had a problem, yet!