And... animal fluids?
Allison: So much animal feces. Since I worked at the car rental counter of a regional airport, it didn’t end with just dogs and cats. It was all kinds of animals. These repeat offenders would get a car to drive to a poultry processing plant north of us and always, always, returned their Chevy Malibu coated in chicken shit and feathers, both inside and out. They never disputed their bill and all the cleaning charges, which was actually kind of annoying. It was an acknowledgement that they knew they left the cars in bad shape, but didn't care.
And if you don’t know, let me tell you, once you grind something into a car’s upholstery there is no getting it out. At a certain point working there, you stop caring how exotic the animal that did the shitting was. The question becomes less "what was it?" and more "how much is it?"
Chris: I got a whole lot of deer blood, one time. It was smeared across the paint job, all over the interior. The guy who rented the car went on a hunting trip with his hunting buddies. And to me that was extra creepy, because it was like he had to have gone out of his way to soak that much of the interior. Like, this was some psychotic, Hannibal Lecter shit.