In the gross category it would be an ashtray filled to the brim with the Porsche owners nail clippings! Why on earth the guy keeps his nail clippings I have no idea but just about lost my lunch on that.
Second would be, in the same owners car, cat turds petrified under the passenger seat. Turns out the guy drives with cats. Like the guy is Norman Bates.
In the "I would never expect that!" category it would be a bag of pot in a surgeons car.
Sexiest category would be a pair of very sexy, very lacy pink panties. This was at the start of my detailing profession and I made good friends with all the gals in this one office so while doing one of the gals cars, a sexy redhead, I came upon the item in question while clearing the car out before vacuuming. They were in the driver seat back pocket so they must of been removed while in the back seat.....I'm only guessing here. So I took them inside after I was done, called out her name and asked her (while I had everyone's attention) "Hey, car is all done, by the way are you missing these?!" I then held them high over my head for everyone to see.
I never thought a red head could get more red
Anthony