I use Moda exclusively and have never prewashed any of it. ESPECIALLY precuts. When I first started working with jelly rolls, I bought some at Wally World. Well, I prewashed them and they all frayed and turned into a big ball of thread. I took it back to Wally World and they gave me my money back. I was lucky to get my money back. I have had nothing but good luck with Moda and I always buy it online.