I discovered that my two hens that were broody both have mites in their crests. I have treated them with frontline and checked the other chickens but did not find anything on them. My question is about the white "gunk" in their feathers, assuming the eggs or mite poop? Do I need to remove that stuff also? Both hens are now brooding chicks so I don't think bathing them is an option at this point.Also, should I treat the chicks? The youngest are two days old. I did treat the others who are 5 weeks old. They are all separate from the rest of the chickens. So disgusting!