We get lots of wasps, and when they are in bad spots I generally spray them with those expensive cans of wasp & hornet killer. Well I gave the last of a can to a friend..... All I had was WD40!! Well guess what- it worked just as well! Smothered the eggs on the exposed nest, they were dead immediately. I just found on in the door jam of my van, and sprayed it too. It doesn't shoot as beautifully, but far enough.