A. Not at all! Actually, it's very simple. Dirt and grime collect in the areas around your car's wheels. The concentrated spray at professional carwashes loosens and rinses the grime, giving you a smoother ride. The spray also helps prevent rusting inside of the wheel wells - the most difficult type of rust to stop.
In addition, tests show that a properly cleaned and waxed car has less wind resistance resulting in a smoother ride and improved fuel economy.