Negative reactions to restroom conditions will keep customers from returning to a restaurant. In 2008, Harris Interactive conducted a poll of U.S. adults and found that diners link restroom hygiene to the overall hygiene of the establishment. In other words, if the restroom is dirty, the kitchen must be dirty. The top turn-off was an overflowing toilet, followed closely by unpleasant odors. We know something about that.
Here are the top conditions that will keep customers from coming back: