I had a wasps nest in my attic. They used to come out of the wall. All I did was make a wasp trapper out of an old squash bottle, half fill with water, teaspoon jam, few drops of washing up liquid and a few drops of vinegar. I placed it near the place they came out of. It traps and kills the wasps. Then you empty them down the drain and refill the bottle. I managed to clear an entire nest that way and none ever came back,.