Sectioning so there is always a dry route
The single most effective control is not signage, it is method. Cleaning half the width of a corridor at a time leaves a dry path throughout, which removes the need for anyone to make a decision about walking on a wet surface. It takes marginally longer and it eliminates the risk almost entirely, which is a trade any operator would make if it were put to them in those terms.
The same applies to open areas: work in defined sections with a clear route between them, rather than treating the whole floor and then attempting to keep people off it. A person who needs to reach a door will cross a wet floor regardless of what a sign says, and blaming them for it afterwards is not a serious approach to safety in a building that is open to the public.
