Zero In Wasp Nest Killer Foam gets rid of wasp nests indoors in the home or outdoors in the garden. The insecticidal destroyer foam spray, which contains permethrin and tetramethrin, kills wasps on contact in the nest. It can be easily applied from 2m, allowing a safe distance between the nest and the applicator. 1 can of the fast acting formula is enough for 2-3 treatments. For best results, treat wasps nest early morning or late evening. Suitable clothing should be worn whilst treating the nest. Do not stand directly underneath nest. Repeat applications may be required.