Two summers ago, I had a wasp nest under the roof outside the shed in the backyard. It was roughly the size of a bowling ball, maybe a bit smaller. From a distance, it looked like it was put together with gray duct tape. The wasps would annoy from time to time as I entered or exited the shed. One day, I got fed up and decided to have at them. I sprayed inside the entrance hole with a high-pressure water sprayer from a distance of less than 5 feet, fully expecting some of them to come out. I figured they would come out and possibly come at me, but I planned on spraying at full power in their direction if that happened. It was probably not the smartest thing I ever did. In any event, I don't recall any wasps even making it out of the hole. I sprayed the thing right off the shed and onto the ground. Not one wasp emerged or attacked me. Upon reflection, I would probably not do that again.