Scent Killer can actually be applied to clothing days or weeks before using. The clothing should be allowed to dry, and then it can be stored until you go hunting. Under normal conditions, Scent Killer will continue to eliminate human odor for many days of hunting. Wildlife Research Center had previously tested Scent Killer extensively in the field, with amazing results, finding Scent Killer to be extremely effective at stopping both human odor, and other types of odors. In addition, Scent Killer was found to be over 99% effective at stopping replicated human odor, in testing at Rutgers University. Now that's some serious performance!