Add one to two tablespoons of any liquid dish soap to water in a spray bottle. A mixture of dish soap and water makes an effective home remedy for boxelder bugs. · a dish soap and water solution repels boxelder bugs. Of dish soap to a bottle filled with water and spraying the boxelder bugs directly. If you spray soapy water directly on these bugs, it will suffocate and kill them. Yes , dish soap does indeed kill boxelder bugs. This remedy involves adding 2 tbsp. · another simple way to get rid of boxelder bugs is to use a soapy water solution. · put water into a spray bottle that’s appropriate in size for the solution you want to make but don’t fill it to the brim because you need room for the soap. · make a soap spray. Add two tablespoons of liquid dishwashing soap to one liter of water in a spray bottle and shake to combine. Mix the solution gently to prevent too many suds from forming. Spray the mixture directly on any bugs you see. A simple mixture of soap and water will kill boxelder bugs. · a spray made from soap and water is a simple way to exterminate boxelder bugs. Add a tablespoon or so of liquid dishwashing soap to a spray bottle full of water and shake gently to combine. Aim for a balanced mixture of soap and water. · does dish soap kill boxelder bugs? Spray the solution directly on the boxelder bugs , and their outer protection will dissolve, killing them. The soap breaks down the bugs outer shells, so they dehydrate and die. This simple household item proves to be a surprisingly effective weapon against these common pests. Add dawn dish soap into the water-filled spray bottle, then shake, shake, shake!