Thanks so much for the info. I guess where I saw at one point not to let them get wet because they have no water proofing and will chill I assumed that meant also washing them off. I am glad to see that what I did was okay and my Mule Duckling was bigger as it had a Muscovy Drake and a Rouen Hen that it came from. Thanks again, I appreciate it.@Luv Ducks , the washing with warm water method is actually the most recommended one. I think I found a single comment on this site during my obsessive research stage after the first one that suggested the toothbrush. It's the only time I've seen a reference to it. In fact, I just pulled out my hatching and brooding your own chicks book, (Gail Damerow), and confirmed. The book doesn't address *why* sticky (crunchy) chicks are potentially an issue, but does say the following reasons are the cause: eggs stored too long, larger than normal for breed, temp too low during incubation, humidity too low during incubation or hatch, or inadequate ventilation during hatch. It also includes a side bar on panting hatchling, in reference to the importance of adequate ventilation, and not just a too hot issue.
Edit: from what I've gathered, and experienced, crunchy chicks obviously reduce the cute factor that comes with proper fluff, but also makes it significantly harder for the chick to stay warm (see crunchy chick from batch of 4) and can in some cases hinder or even prevent some mobility, like the wings.
Also, somewhere on here is a super handy thread with differences between shrinkwrapping, sticky chick and what I'm referring to as crunchy chick
Edit number 2: here's the link I mentioned. And I remembered to bookmark it this time!
https://www.backyardchickens.com/threads/shrink-wrap-vs-sticky-chick.491421/