Once your car has accumulated a substantial layer of dirt and grime, there is a greater risk of causing paint defects during the wash process. This is caused by a greater number of contaminants existing that may unintentionally be moved around over underlying surfaces as they are removed, and the tendency to scrub the paint more to get it clean. A simple approach that can minimize the risk is to rinse off as much dirt and grime as possible using a hose or a pressure washer before washing the exterior finish by hand.
Five to ten minutes of pre- rinsing off the exterior is time well spent, but may not always reduce potential scratching, but will significantly reduce paint defects. One more step and or pre caution can be taken to remove two to three weeks worth of dirt and grime with the use of a pre-wash foaming solution, this will help the friction of the grime & dirt from damaging the finish. The idea behind applying a Gloss Shampoo to the car in the form of thick clinging foam ... more.
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