Here is my issue.... I have a white Leghorn who has been laying since October and soon after that she started getting dirty butt feathers. I thought the problem was that she was sleeping in the nest, but this is not happening to my EE. I have washed her butt 3 times now. What is obviously poop rinses off easily with warm water. There is this other "stuff" that is stuck to the base of her butt feathers right near her skin and it is not affected by the water at all. The texture of it is grainy/fuzzy and it is greyish in color. I have no idea what this is and I can't figure out how to get it off of her. I hope the picuture helps and hopefully someone else has seen this before. Sorry....she just had a shower so her butt doesn't look too cute in the picuture.