I am having a problem with a Black wasp like insect in my house. killing 20+ a day. They are usually found and killed in window (going to light?). They don't sting. I have sprayed malathion, spectracide, with a surfactant outside windows & door. I cannot find where they are coming from or getting in the house.
How do I get rid of them? I have tried to seal the windows and the door to bed room and bathroom where they are found.