I believe that your services could be enhanced by allowing customers to rate toilet facilities in terms of cleanliness by location. This is an important issue especially for women. Business owners would start to value the sanitary conditions of their facilities. Besides the ratings, allow patrons to take pictures. Who would want to use a "pitty potty"? Why not choose the next restaurant with a better rating while traveling?
I would dare to say that there is a positive correlation between kitchen cleanliness and bathroom cleanliness. This would be a way to improve the health of our country but without more government intervention. This would be another way to draw more people to your site.