May be fogged, sprayed with a pump sprayer, or set out in cups or on cotton balls. It works by absorbing the odor molecules and breaking them down. Dead animals, mildew, smoke and decay. Attics, basements, crawl spaces, walls, and just about anywhere the odor is present. Retreatments may be necessary.
Product works best when delivered to point where the odor is thriving.
Though one treatment may solve the problem, expect to apply it on a regular basis if the odor supply is from a large animal or a source which you can't treat directly.