Before a car can be polished or waxed it must be properly cleaned. The dirt on a car can be abrasive; therefore, it is best to thoroughly rinse off as much of the dirt and grime as possible prior to washing. Avoid getting water on the engine or any electrical parts under the hood, as this may cause damage. Only use products designed for automotive finishes; harsh cleaners can damage the paint. Washing and rinsing the car section by section, starting with the roof, will help prevent water spots which can be difficult to remove after the car has dried. After thoroughly washing and rinsing, dry the car using an automotive grade microfiber cloth or squeegee.