First if you have a sprayer at the kitchen sink I would take a couple and hose them down, gently. You may want to get a glass 8x8 baking dish with a little liquid laundry soap and water or what ever you use for hand washables and roll them on their sides a couple minutes. Then on a rack hose them down with the kitchen sprayer over the sink. I would then lay them length-wise in a thick terry cloth towel and just press and roll them. Then let them dry over night. After that you can test them to see if the fibers have intertwined or not and try sewing with them. You can also take a blow dryer to them for faster results. If they do well then you can do the same to the rest of them by using a larger baking dish, etc. You could also probably put them on a type of drying rack and it probably wouldn't take long.