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Truthfully, I don't think much of adding ladybugs to an area. If you have lots of aphids, the population of native ladybugs will grow to comparable numbers without buying extra. Wasps and hornets are good aphid controls...as is a strong shot of water.
Soaps are milder....but even soaps can harm plants, because you don't know the fats and oils that were used to make the soap. Some might hurt plants, some might not.
Commercial insecticidal soaps are manufactured and tested to be safe and effective. Why not use them and not risk plant harm?