NosGuard SG Auto Odor Eliminator - Fast-Release Vapor System Fast Release "NosGuard Auto Odor Eliminator" Formula begins working immediately to eliminate foul odors caused by mold, mildew, pets, food, smoke and more Quick-release, deep penetrating vapor eliminates tough odors within 4-6 hours; doesn't just cover them up Each patented CLO2 chlorine dioxide generator pouch treats one vehicle safely and quickly Professional strength treatment for removing even the toughest smoke odors Not a perfume or fragrance; air out vehicle after treatment