I have two white pavlovskya hens that are in desperate need of a bath. A summer full of sticking their faces in watermelons and muddy days has taken its toll and the girls look dingey to say the least. I've bathed some of my other hens before but I've never bathed hens with such fluffy heads. What is the best way to clean the feathers on their little noggins and make them look extra white? Any advice would be greatly appreciated.