> Anyway, the problem seems pretty trivial to solve: have a button so riders can report disgusting cars, send the bill to the previous occupant. The workaround

> Anyway, the problem seems pretty trivial to solve: have a button so riders can report disgusting cars, send the bill to the previous occupant. The workaround seems to be: do whatever you want to make the cab disgusting, then press the button. (If the button has to be pressed at the beginning of the ride, then press it at the beginning, then do what you want.)