Although carwashes are very popular, they are not the place where detailers are found. There is a reason why detailers don’t like a carwash. The art called detailing/valeting is very different to the service that is offered by a carwash.
Car shampoo is a specially formulated cleaning liquid that is used in combination with a washmitt to clean a car in a safe way. It is recommended to wash a car with a proper car shampoo and the 2 (or 3) bucket method.