Mosquito Steve's wasp control treats the surfaces wasps want to build on, eaves, soffits, porch ceilings, door frames, play sets and sheds. Our plant-based essential oils kill scouting queens keeps nests from ever going up. Hose pressure can easily reach a second-story eave from the ground, and the formula is plant essential oils, so it can go on a play set your kids climb on that afternoon.