It's not mine either. Having spent a few years in the cart barn, we washed them out, wiped the seats and compartments, filled the sand, and even repaired the fiberglass bodies when the occasion warranted. The owners wanted us to take care of their investment so that at the end of the season they were able to get the maximum credit on the new fleet along with every golfer having a clean ride.
I once had a clean cart that had chew that someone spit out right near the gas pedal. Too bad the owners of the courses in question don't think alike. That was pretty disgusting and not something I needed to have on my shoes before starting.