In this case, I think people need to realize what they are signing up for. If you deliver pizza it's a given you will start reeking of pizza. Uber is notoriously used for designated driving, and anyone surely knows by adult hood that having diarrhea isn't a matter of if, it's a matter of when, and basic probability would tell you eventually will get a customer with diarrhea or someone who is about to throw up their tequila. Luckily Uber has some protections for you in the cleaning fee charged to the offending customer, but with Uber's excellent way around lobbying, that's about all the protections to your vehicle you can ask for with this gig.