Wildlife has done extensive field and lab testing on Scent Killer with amazing results. In fact, Scent Killer was found to be over 99% effective at stopping replicated human odor in testing at Rutgers University. The Wildlife Research Center Scent Killer spray is ideal for dousing boots and clothing before heading out into the woods during hunting season. This formula eliminates human odor and a heavy application of this spray can keep working for days. Autumn Formula 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.