these waterless systems are great tool to have. i use another brand, but after
driving my very clean hobby car though some puddles i use waterless cleaners
on the side panels, etc. to remove the soil; followed by my favorite QD.
the main trick is to use a lot of product and saturate the area. and wipe off
with plush soft MF towel... use only the clean section of the towel.
beats washing the entire car just to clean a section of the car.