Wildlife Research 576 Scent Killer Autumn Formula, Quart and Spray Bottle Combo. This spray is a high-powered human odor elimination formula that has been chemically blended with the scent of autumn woods and fields. The result is a very mild masking scent effect along with high-powered scent elimination qualities. Over 99% effective at stopping replicated human odor in testing at Rutgers University. Engineered to fight human odor while adding a subtle scent of the woods and fields during the fall. Long term effectiveness. Use the complete Scent Killer System for maximum results.