I gave my first chicken bath today. Being new at this I used baby shampoo. It went well but she is a paint silkie and the baby shampoo didn't really get all the discoloration out from the sand she rolls in. Anyone have any ideas of which shampoo to use to brighten up the white that is chicken safe. I use quick silver on grey horses but wasn't sure it was safe for pullets. Attached a pic of results.