A few years ago we had a wasp’s nest hanging down from a branch of a tree in our garden. A friend said he could get rid of the wasps but would need a large bucket of water, a step ladder, a pair of secateurs, and a pint of beer. Intrigued, we assembled his requirements and welcomed him to the garden as dusk approached.
The beer was for him to drink while waiting for the last wasp to enter the nest. He then climbed the step ladder with the bucket of cold water, positioned the bucket just below the nest and then cut the branch with the secateurs so the nest dropped into the bucket. I’m not sure whether it was drowning or heart attack due to the cold water that did for the wasps.