Amy, I had a new chick with horrible pasty butt, once. The person who had incubated the eggs for me did some research and told me that some chicks look like they have manure stuck to them, but it's actually some undeveloped internal parts. She told me not to clean it, to leave it alone until the chick matured and then it would come off. I don't remember what it was called or the details. I did just let it dry up & it fell off on it's own. That chick was a very late hatcher and had trouble getting out of the shell. It ended up being a rumpless cockerel.
I thought that I would mention it because you can kill these chicks if you try to pull off what looks like manure but is actually part of their body.
