What's the floor substrate ? Wood or concrete ? The usual method is to apply a good membrane/tanking layer, then a layer of cement, made with as little water as possible. The magazine "Fine Homebuilding" has run several articles on building wetrooms - look at their website via http://www.taunton.com
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Now I understand the question and see that it is not a practical joke question. Good suggestion.
Soap will work but too easily washed off. A good oily substance like diesel or cooking oil would "last" longer and is slippery as hell.
Do you want money or a laugh? L
Putting it another way: Do you want to sue, or be sued?
Well aye. I think of soap,