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Sometimes it can be caused by too much heat. Check your temperature in the brooder. The first week should be around 90 - 95. If they all have it, that may be why. As far as cleaning them, it is important they don't get it caked on and can't poop. I just soak it with a warm wet paper towel, and it usually comes off easily. Don't pull at it, as it could pull out insides. Gently scrape it away.