If you notice wasps flying around your home and escaping through holes in your wall, you may have a wasps' nest in your home. Indoor wasp infestations can be hard to control, but according to the University of Minnesota Extension, boric acid, though slow acting, is an effective wasp killer that you can apply to wasps' nests in your home or attic.
Wear heavy clothes – shoes, a long-sleeved shirt and long jeans – to protect yourself from wasp stings. Wear protective goggles and work gloves to avoid contact with boric acid.
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Drill a few holes in your wall around the holes where you've noticed wasp traffic.
Fill an empty detergent bottle with boric acid. Place the lid on the bottle and lift the tube tip to the "open" position.
Turn the bottle so that the tip faces the holes you drilled.
Squeeze the bottle to "puff" boric acid into the holes.
Seal your holes with caulk when you are sure all the wasps are dead. This will prevent future wasp infestations.