I dont know.
I did not train them. They just do as I want them to , when I need them to.
This includes taking baths.
Sometimes, I will hold one of them in the shower with me. Especially on super cold mornings.
Flash Gordon loves this.
I stand in the shower with the water just coming over my shoulder and he puts his head under my chin and starts to purr. He gets warm water and so do I.
Kitten, my 10 year old, likes to take baths with me. She really does not like the shower. If I am sitting in a warm tub, she sneaks in the bathroom and gets in the water... lays on me.. and will nap if I hold still long enough.