It's not unusual for Cleanliness to pop up as a top pain point for transit riders. Cleanliness is an important aspect of the customer experience, and clean transit systems are more likely to keep and attract riders. Cleanliness, however, means different things to different people, so it is important to drill down to identify the aspects of cleanliness that most need improvement. Is it litter? is it stains? Is it spills? is it the hygiene of surfaces? Is it smell? Biohazards?