A/C Pro Vent & Duct Cleaner Odor Neutralizer helps malodor from your vehicle's interior caused by mold & mildew, stale air, and smoke. Specially designed for automotive HVAC systems, A/C Pro Vent & Duct Cleaner Odor Neutralizer treats vents, ductwork, evaporator core and drain pan areas while removing light dirt from ductwork and dirt and dust that sits on vent surfaces. Not a mask or cover up, this specially designed formula neutralizes odors.