I remember a scene from an anime which I can't identify. (I don't remember whether it was a film or a series.) It was in the style of The Girl Who Leapt Through Time. I watched it about 3-10 years ago but it could be much older.
What I remember: A poor girl works in a public bath and is forced to wash a special guest who the other girls working there don't want to wash. The guest is coated in mud. The girl gets help (maybe animals?) / a special soap. She uses the soap on the customer and the mud vanishes. As a thank-you she gets a reward. I think I could see gold coins in this scene.
I already went through the list of anime I remember watching but it was none of them. As this scene regularly comes to my mind, it annoys me not to know where it's from.