I have a few broodies that for some reason will not get off the nest to poop. Zarah has loaded these eggs with poop which has dried on them. HOw on earth do I get this off without damaging the chicks inside them? SHould I try sandpapering it off until it is at least just a thin layer? These eggs are completely fouled - one has a layer of about half an inch thick in the one section and it is like concrete!!! I am concerned about the chances of the chicks ... anyone else had this happen? I have had two hens in a row that would not get off the nest by themselves - what is the deal with that!?