Like Sewcrafty, I just throw my fabrics in with the regular laundry when I buy them. If thee are a lot of darks, I'll add a color catcher or dye grabber. I don't iron until I go to use them, but if you take them out of the dryer right away,they are generally not too wrinkled. I even do that for stack and whacks and haven't had any problems with aligning the layers.