 You want to dry them on the lowest temperature that you can attend or even on air and let them fluff around in there. They don't have to be perfectly dry when you take them out of the machine. Just dry enough to use again. Because plastic does melt. Yes, it does. Heat is their enemy. I mean, you can wash them on warm water. That's fine. But you don't want to dry them with any heat. And also, I highly recommend just using a microfiber detergent. They will keep the absorbency going so that the towels aren't clogged up with residue.