I don't need to imagine, I've seen MUCH worse than that would have been. One guy blew about 100 pounds of feed corn out of his bed, didn't even pull halfway through the bay, just blasted it all over the lot. Stopped one guy barely two seconds in trying to wash a trough made from a steel drum that had about four inches of diesel oil in it. He only managed to get it all over himself and his truck before I switched it off on him. I caught a guy with a hoe about to scrape 6" of some kind of sandy loam out of his bed. He says "It's for trucks, I figured it's okay." No, it's a handicap access bay. Caught a bunch of young adults recently just before they blew a whole bunch of garbage out of their bed, called the police because the plate came back to a car. I told them (and I tell everyone now) "Clean it out at home, then you can wash the bed here." I won't loan anyone a broom and dustpan to clean out their bed because of their intent, and I don't want their business anyway.
I'm not even going to get into the grease and oil, the paint, the cement mix left to harden, something that I suspect is tire slime...
Strangest thing I've seen must have been a locksmith that washed out his van after many years, a couple hundred thousand
lock pins everywhere.