Thanks for asking this question and thanks to lizardz for saying she washed her Faverolles. Our Fav, Bubbles, needs a bath desperately - dirty feet, dirty face and poopy butt. I was very uneasy about giving her a bath but is sounds like it's really no big deal at all. And she's so mellow and easy going. I'll use a non-harsh natural soap since she has no feathers on her back or head (thanks to an overzealous rooster) and I don't want her skin to dry out. I'll make sure she's really dry before putting her coat back on her and going outside.
Thank you!