All Day Synthetic Odor Eliminator with Infinite Shelf LifeBuck Fever Vanishing Hunter Spray is a synthetic blend odor eliminator that works by neutralizing odors caused by bacteria neutralizing lactic acid and stopping the formation of gases caused by bacteria growth. It lasts all day long and its infinite shelf life means it will not lose effectiveness over time. Synthetic odor eliminator spray Neutralizes bacteria based odors Neutralizes lactic acid Helps stop gas formation All day performance and long shelf life