A good personal tip if you cannot find the the tight spot is to use flour. It helps alot in finding wet areas. If there are no wet areas, see it either as a lack of flour or as a subtile hint for defeat.
If it was a subtile hint for defeat, and there are no wet spots.. So to say... regardless of how sick it sounds, you could always take revenge and go all out with the flour.. Just for the sake of bringing flour-chaos.