Car detailing services are very important when water sticks to the surfaces and the optics appear dull. When a car wash and wax only last a week, then a car waxing service is no longer good enough. This does not mean that you need to run out an get a full detailing service, but you will need a car buffing service to repair the micro surface.
Look closely at your car clear coating and you may notice micro damages wreaking havoc on the protective finish. Some are scratches and others pollution damage. Without professional car detailing services, these problems only get worse. Once the cars clear finish goes bad, the colored paint goes bad next.