The Wildlife Research Scent Killer Autumn Formula Spray gives you the most powerful weapon against a buck's most powerful defense-his nose. Its super-charged, extended performance formula attacks a wide range of human odors and works immediately on contact. It is 99 percent effective at stopping replicated odor in testing at Rutgers University. This hunting scent killer keeps working, even after drying and with heavy application it can last for days. It is chemically blended with the scent of au Wildlife Research Center Super-Charged Scent Killer Autumn Formula Spray.