Beyond physical cleaning, baths represent spiritual purification. Publications like DATTO GIRLS 03
It is possible you may be thinking of the character from the 2022 Makoto Shinkai film Suzume ( Suzume no Tojimari ).
As Kenji disappeared into the men's side, Suzume didn't go back to her polishing. She went to the boiler room. She added a few extra logs of cherry wood to the fire and tossed a handful of dried yuzu peels into the filtration system. She knew the "regular" soak wouldn't be enough for someone who looked that hollow.
Mino Suzume's impact extends beyond her specific roles. She is credited with helping to redefine professional standards in her industry. Her success led to her being featured as a case study by social scientists, and she has been invited to speak at mainstream events like the Tokyo International Film Festival.
In Japanese commerce, a Kanban Musume (poster girl or storefront girl) is an attractive woman whose presence draws customers to a business. Placing an actress of Mino’s stature into this role contrasts the everyday, blue-collar setting of a bathhouse with high-end glamour.
The title outlines a classic narrative framework common in Japanese adult dramas:

