I would soak them in oxyclean and then hand rinse and air dry. maybe spin them out in a lingerie bag. I think it would be awesome to get a few repos that would coordinate and make a table cover with blocks of solid and blocks of yoyos. Kinda like a battenburg lace of yoyo's if you will. Of course, I would only go to all that trouble if 30's fabs fit my kitchen/dining decor which it would. Just an idea. Have fun!