Odor Eliminator is phenomenal. Some of our trucks have 700,00 miles on them. My drivers smoke, so the interior odor used to be terrible, and it even got worse as it built up. We tried other products, but they don't run thru the ventilation system like yours, so they only cover up the odors temporarily. We tried cleaning with ammonia but that only worked a few days. Auto Tech's Odor Eliminator finally solved our problem.