Once the road film and soil have been loosened from the truck's surface by Autowash 1, Autowash 2 is used to completely remove these soils from the surface. In addition to working synergistically with Autowash 1, it will neutralize the acid cleaner to deter any corrosion that might otherwise occur. Autowash 2 can also be used alone as a high alkaline, free rinsing pressure washer detergent.