Pre-washing precedes vehicle washing.  It's usually done with a foam gun or lance.  The foam will cling to the dirt and other contaminants, making them disappear when the car is rinsed.  It's a step that's often overlooked, but one that can save you a lot of trouble in the long term: the appearance of scratches and other scuffs on the bodywork.

Prewash products for cars and other vehicles

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