Have you heard of Zipcar? There are lots of reasons to be skeptical that we'll see autonomous taxis in less than decades but this doesn't seem like one of the bigger problems.
A car sharing company accused me of leaving a dirty vehicle. Apparently I had picked up smoking and gotten a dog without knowing it. They were quite adamant about charging me a cleaning fee until I got American Express involved.
Presumably there were one or more intervening drivers between whoever caused the issues and you who didn't notice or didn't think enough about it to complain. (Both the things you describe are probably way more irksome to some people than others.)
