I worked in a detail shop at a dealership in college as well. Man, some of those vehicles were used and abused! I remember prying a melted McDonald's cheeseburger out of the carpet of a Chevy Equinox once. Smelled like death in that vehicle. When we quick cleaned, our equivalent of Armor-All became a universal cleaner. They didn't care as long as it made it look shiny.
I'm 100% certain it was the dealership quick cleaning it to get it ready for me. I actually got a call from the previous dealership (Adventure Motors) who sold it to their friend and they told me to jump on it. I'm glad I did, but the dealership didn't even have time to get the pictures up on their website, so I'm sure they did a quick clean and sent it on its way. I did a deep clean of the carpet and DAMN. Lots of dog hair and spills. It's a good thing the carpet is black! I'm going to try using McGuire's Plast-X to remove it, but if it doesn't work then I have a new lens on order from the closest dealership.