[minikomi]

Car sharing services in Japan ask you immediately (via the navi) what the state of the car is. I imagine it negatively impacts the previous rider in some way. A simple social pressure like that can work wonders.

[noir_lord]

> A simple social pressure like that can work wonders.

So would variable pricing based on how often you leave the car a mess (with appropriate filters to mitigate against the trolls).