I have a rooster that seems to have very hard, dry, caked on poop around his vent. I've been trying to get it off, but it's stuck hard. I've given him a bath in warm water - soaking for about half an hour. It didn't help. I've been slathering his butt with A&D ointment, and it's not helping. He's having a hard time pooping, not sure what to do. Anyone here ever had a similar experience and have a solution?