So let users reject a ride that arrives with excessive mess. That car goes to a cleaning facility and you wait for another one. If the car was in fact messy, t

So let users reject a ride that arrives with excessive mess. That car goes to a cleaning facility and you wait for another one. If the car was in fact messy, the previous user takes a reputation hit and may eventually get charged more, if it happens enough to have high confidence they're really at fault. This gives an extra incentive for users to go ahead and report, if there's a problem. On the other hand if the car was fine, then a separate reputation score starts to lower the weight on the rejecting user, eventually just keeping their rejects in service instead of sending them for cleaning. It's up to the ridesharing service to decide what they consider "fine," probably something along the lines of "X% of users wouldn't report this."