Spray Body Prep Solvent on both the cleaning tool (an applicator pad, in this case)...
... and directly on the surface to be cleaned.
Vigorously agitate the Solvent on the surface.
If the petroleum-based soils are especially heavy (particularly tar), a more abrasive Doo All Pad may be required for agitation.
Fenders and fascias are prone to heavy tar.
Thoroughly pressure rinse all areas cleaned.