Should You Remove Old Wasp Nests?
What are the facts regarding Should You Remove Old Wasp Nests? Get the answers in this feature article.
Use a powder/dust to kill these wasps. make several attempts to eradicate a nest behind an air brick. Usually, 3 daily puffs of Rentokil Wasp Nest Killer Powder will do the trick. Apply over the whole air brick as the wasps will use other holes in the brick if you don't treat all the vent holes.