How to Make Insecticidal Soap for Houseplants - Martha Stewart
https://www.marthastewart.com/how-to-make-insecticidal-soap-8585107
WEBFeb 20, 2024 · Insecticidal soap is made by combining distilled water, soap, and vegetable oil. Vegetable oil is completely optional and just helps the mixture stick to the leaf before drying. "The fatty acids in the soap are what actually kills the insect, so you can go without the oil if you don’t have it readily accessible," says McEnaney.
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