I am a car wash owner myself if this may have happened at his store you probably don't know all the details just like people normally tend to leave out. I will say this one time at my full service which I own two car washes but that just like on time when I had a customer that had a Jeep Cherokee who told use to leave his car running through the car wash which we normally had cut them off but we left that one running it then took off down the car wash and luckily we had a car wash employee catch the car before it exited the car wash and no damage was done. I will say this Jeep Cherokee have a throttle cable problem and will take off while in neutral beware because it can hurt someone. I don't know what type of car this but if was maybe go back to the company that makes them.