Yes, I have been informed that you can buy reusable "swim diapers." But if you, like me, have packs of these that you want to use, you can not throw them away every time!
It was my sister-in-law (thanks AD) who informed me that if they are not "pooped in" you can wash these and then hang them dry. I tried it today and, yes sir'ee! Reusable! Way cool.