I guess we are dinosaurs. I always wash my fabric. Always. But, as you say, what do you do with pre-cuts? I saw a blog where the signature blogger used a salad greens spinner and "washed" them in that. I still do that to my pre-cuts, using it to wash them after I pull them apart, then add some mild detergent for delicate fabrics, then rinse them until there is no more "suds" and the water runs clear. I am of the opinion that I don't want all the chemicals they use in dyeing, stretching the fabric for use, and all then ironing them and rolling onto a board (bolt), then shipping them. I know that some material is subjected to things like formaldehyde and other harsh chemicals and I don't want that in my quilts, especially in the baby blankets I make. And they come out smelling and handling so much better. Just my opinion, but I feel like I have a right to my opinion, too.