I have two detailing episodes to tell...
I once cleaned a car for a friend of mine who bought it for his daughter as a birthday gift. While vacuuming the interior, I placed the nozzle under the passenger side front seat and heard a "clunk". I pulled out the nozzle and found a "double dong" sex toy. Not knowing where the toy had been, I put on a pair of latex gloves and placed the item into a large ziploc bag.
When my friend came by to get the car, I asked him if the toy was part of the birthday present!
I used to do detailing at a body shop that specialized in high end cars...Mercedes, Rolls Royce/Bentley, BMW, Ferrari etc. I had brought a BMW 8 series out of the wash bay and I noticed a "rattling" sound coming from the trunk. I talked to the tech who did the repair and he came over to check it out. He found a loose bolt in the trunk area, and said that he would use the tool kit from the car instead of walking to the repair area (the shop was in a very large building). He opened the tool kit to find no tools...just a 9mm Glock and a bag of what appeared to be cocaine!
He did the Sgt. Shultz routine from "Hogan's Heroes"...I see Nothing. He went to his tool box, got the appropriate tols and tightened the bolt. The owner of the car came by the shop to get it, asked who did the repair and the detailing. We were called over to customer service. We thought we were in BIG trouble. The owner of the car gave us each a $100 dollar bill as a tip and said "nice job, guys!" Whew!