Most all my equipment is outside. That's the first thing I do before moving any of it--Check for wasp nests. I typically keep 4-5 cans of wasp spray around the place. The lawnmower is in a 3-sided shed and that shed is favorite for yellowjackets. Those things will build a nest anyplace they have cover. I've had them flying out of my engine hoist, so I keep all the
extra holes covered in tape. Under my sawhorses is another favorite spot. I hate them. Yellowjackets will sting you for the fun of it.