When I was younger, 16 (ohhh sooo many years ago) I used to work in a carwash. The type with the conveyor, rotary brushes etc. I've seen so many cars damaged in them, some drivers fault, some operators fault. I've got three examples.
First one, you gotta realize this is when antennas were telescopic. We were supposed to retract them (even tho the signs said the driver was supposed to) as far as possible so the last overhead brush wouldn't tear them off. This brush was 24" or so in diameter full width of the car. I forgot to retract one and when it got to the last brush, it got wrapped around the bristles, torn out of the bottom section and proceeded to beat the living crap out of the right/top side of the car. Driver was pi$$ed. Boss got out of it because it was signed not responsible both for retracting them and any damages.
Second one. The first spray is recycled water to remove the first layer of dirt and just wet the car down. Water goes into an underground settling tank and is sprayed over the complete car via high pressure nozzles. Boss, being a cheap aZZ was always slack pumping the silt out of the settling tank. One long, sunny weekend the tank filled up to the intake and no water. So, a couple of us said, "heck, we can push the silt away from the pickup until we get a pumper and carry on' ....which we did.
First car thru after we did this was a nice, shiny fairley new Cadillac. Ever heard of hydro blasting....I think we discovered the process, least ways that weekend we did. The car came out without a shiny bit on it other than bumpers and windows. The driver was old and apparently either blind or not very observant and took off, never to be seen again.
Last was no ones fault..kinda. There were two overhead drying blowers/nozzles at the end. Not sure but they were at least 20hp apiece. You couldn't walk thru them or they'd blow you over.
An old but nice Chey convertable was going thru. When converts go thru, you were supposed to manually lift the blower up so it didn't ride on the contact wheel like it does on a hard top as there was..well..no hard surface on the roof of a convertable.
The dryer guy at the end had gone for a nature call and neglected to tell anyone. Contact wheel went over the hood, up the winshield and sunk into the roof a couple of inches as it was 6" or so ahead of the actual blower nozzles. The front edge of the roof opened up a bit which let the air blow into the cab of the car pretty much pressurizing it and blowing the roof up. You gotta think, a convertable roof is meant to take air from the outside, not the inside, it's not really a pressure vessel. If I remember correctly, they did go good for that as it was operator error.