Vehicle paintwork, including painted wheels, contains microscopic ridges called capillaries, these ridges collect ferrous oxide iron from the environment, most typically from industrial fallout, rail dust, and manufacturing processes. It forms a chemical bond in the ridges and prohibits the bond of any wax, polymer, or silica-based paint protection.
This service dissolves the graphite compounds found in automotive brake materials. These are highly corrosive elements and in addition to the environmental contamination from railways, manufacturing & industrial fallout, your vehicle's brakes are constantly spewing these corrosive materials onto your wheels and clear coat.
Have you ever noticed those microscopic yellow rust spots on the exterior of your car (particularly white and silver cars)?