@Geraldine60 it can be difficult to remove a review. I see some chance for you, though, because the guest reviewed you for cleanliness without seeing the listing. AirBnB's content policy says, among other things, that reviews violate the content policy if:
- Reviews that do not represent the author’s personal experience or that of their travel companions
https://www.airbnb.com/help/article/546/what-is-airbnb-s-content-policy
Be aware, though, that I have heard from some hosts on this board that they believe that the even when a review is removed, the affect of the Star-ratings stays.
Contact AirBnB host support to request help with the problematic review.