WD-40 is sometimes used as improvised method to kill wasps, as it is petroleum-based spray that can clog wasp spiracles and cause suffocation, and it can kill wasps on contact, but it is not labeled as insecticide, is flammable, can damage surfaces, and is not recommended as safe or effective wasp control compared to proper insecticides and professional removal. WD-40 contains solvents and oils that coat wasp body and block breathing holes, leading to suffocation within minutes, and its spray pressure can knock wasps down. However, WD-40 is not designed to kill insects, it does not have quick knockdown like wasp freeze sprays containing pyrethrins that kill in seconds, and it may agitate wasps before killing, provoking more stings and releasing alarm pheromones that attract other wasps. It is flammable and should not be sprayed near open flames, electrical outlets, or nests in wall cavities where fire risk exists, and it can stain and damage paint, wood, and plants. It also kills beneficial insects indiscriminately. Safer alternatives for wasps include soapy water spray that also clogs spiracles but is less toxic and not flammable, commercial wasp sprays that shoot up to 20 feet and kill on contact and are labeled for wasps, and professional pest control for nests. So WD-40 can kill wasps by suffocation, but it is not recommended due to fire hazard, surface damage, lack of labeling, and risk of provoking colony, and proper wasp sprays or professional removal are safer.
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