Why does my car still look dirty after a contactless wash?

Touchless chemistry removes loose soil effectively but can struggle with bonded traffic film, oily contamination and static road grime. Mechanical contact is often needed to fully remove the thin film that remains after pre-washing. Lower panels, the rear of SUVs and hatchbacks, and areas behind the wheels usually hold the most film. A light contact wash after the touchless stage solves most of these cases.