Carwash

noun

1. An event at which people (often children) wash cars, often for a small fee or donation
2. A place at which a car is washed, usually for a fee and often mechanically by driving the car through a tunnel.

   "I'm going to take the car to the car wash."

3. An instance of washing a car, especially such a place.

   "I'm going to take the car in for a car wash."