For those who care about the environment:
They are best dealt with in the night or early morning when it is cool and they are in their nest and drowsy. One can place a sturdy plastic bag around the nest and remove it to a freezer. Or release the nest somewhere that won't give your problem to someone else.
I believe that Pyrethrin is a organic insecticide to kill, if that is one's intention, the stinging winged ones. It is derived from a South American flower. It is a broad spectrum insecticide so care must be taken not to spray other unintended targets.
Common wasp killing sprays (unfortunately, like many other products on the market) are full of toxic chemicals that have strong negative effects on other wildlife and humans, and should be avoided if at all possible. Hopefully someday humans will awaken to the environmental damage that their everyday choices create, and choose to live more sustainably.
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