I recently updated my listing to add a House Rule of no sit-down bathing or filling the bathtub with water allowed - Showering ONLY.
I share a bathroom with my guests and do my best to spot clean (quick 5 minute or less onceover) throughout the stay.
I find that when guests take baths, it really requires a more in-depth cleaning than I can accomodate during a stay (I find it rude to clean with guests around). I personally do not take baths for this exact reason.
Also, I have an antique bathtub which was recently reglazed. Additional/excessive cleaning can ruin the glaze faster. Do you think this rule is unreasonable? Is there another way to express to guests that I really don't want them to take baths in there?