Can anyone tell me if I should bath my chickens. The white hens are now dark grey and look awful, They are always digging large holes and using their wings to spread dirt over themselves and most of it seems to stick. This is their/my first winter as a chicken owner and I wonder if they will naturally clean up when the better weather comes. I add sunflower spread to the cooked vegetables I give them and I wondered if it was making their feathers too oily which would cause the dirt to stick. Apart from their appearance, they are healthy and they have each laid every day throughtout the winter.