They could put a button on the car to report dirty/smelly/broken car. When pressed, the button would let the car know that it should go to some place for cleani

They could put a button on the car to report dirty/smelly/broken car. When pressed, the button would let the car know that it should go to some place for cleaning/maintainance soon and also, depending on how comfortable we are with the required surveillance, fine the previous user of the car either for spilling the drink of for not reporting it.