Armor All Duct and Vent Cleaner Odor Neutralizer is created specifically for automotive heating, ventilation, and air conditioning systems. This special odor eliminator formula lets you treat the vents, ductwork, evaporator core and drain pan area, helping to eliminate a variety of odors caused by mold, mildew, stale air and smoke. Armor All duct cleaner also removes light dirt that resides in ductwork, as well as dirt and dust that sit on vent surfaces. This auto cleaner for vents and ductwork is easy to use and requires little effort. Simply spray this car interior cleaner into each vent and into the outside air intake grille, turn on the air conditioner, and let the car ventilate. Help keep your car smelling fresh with Armor All.