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Fatty Acid Products
Insecticidal soap is sold commercially for aphid and other small insect pest control; These products may not always use the word soap, but they will list "potassium salts of fatty acids" or "potassium laurate" as the active ingredient.
Certain types of household soaps (not synthetic detergents) are also suitable for pest control but it may be difficult to tell the composition and water content from the label.
Potassium-based soaps can be soft or liquid.
Insecticidal soap is most effective if it is dissolved in soft water, since the fatty acids in soap tend to precipitate in hard water, thereby reducing the efficacy.
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