THIS WORKS!!! Just killed a HUGE wasp flying around my bathroom! Make a natural insecticide with peppermint oil. Mix 2 cups (500 ml) of water with 30 drops of peppermint essential oil and 2 Tbsp (30 ml) of dish soap in a spray bottle. Spray this solution on wasps and nests.
Who knew.... Wasp Trap and Killer - Fill the bottom of the bottle with one fourth of a cup of water, one teaspoon of dish soap, one teaspoon of sugar, and a teaspoon of alcohol. The soap and alcohol will kill wasps, and the sugar will attract wasps to your trap.
Take a gallon milk jug and cut an upside down V shape in the side 2/3 way up on the jug. Press the tab in. Pour fruit juice 1 inch deep into the jug. Put the cap back on the jug and hang. Insects enter through the hole and can't get out.