- 1). Pour 1 qt. of water in a teapot and bring the water to a boil.
- 2). Grate 1 1/2 ounces of Fels-Naptha soap into shavings, and melt them in the boiling water. Stir until completely dissolved. This will provide you with a soap concentrate.
- 3). Spoon 1 tablespoon of the soap concentrate and 1 tablespoon of vegetable oil in to an empty spray bottle.
- 4). Add 1 quart of water and 1/4 cup of rubbing alcohol to the spray bottle. Shake to combine.
- 5). Squirt the homemade insecticidal soap directly at any insects you see. They will die upon contact.
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