Answer: The insecticidal soaps are made from plant-derived fatty acids and are safe to use against soft-bodied insects on a variety of plants. Regular dishwashing soap contains fatty acids that can burn plant leaves, plus they contain degreasers and other chemicals that are not plant-friendly. Don't try to make your own concoction. Instead, either hose the aphids off with a strong stream of water from the hose, or use a commercially prepared insecticidal soap.
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