It can depend on what colour they are..and how dirty they are... Some of my white chested ducks sometimes have a dirty stripe that I use a bit of soap on- but I dont put them in soapy water. I rub the soap on my hand only washing the effected area. I change the water in their swimming tubs and let them clean themselves mostly though. I do bring them to the laundry tub the night before a show to scrub their legs and feet - then pen them each separately for the night to help make sure they are still clean in the morning- a bit or moisturizer cream or olive oil on the legs as they go into to cage..and they are done.