I have been to lectures about gardening..by Ciscoe Morris, and Scott Conner here in the PN..and a few others less well known. They all say make your soil healthy and stay away from chemicals.
Make your soil healthy, but you will not be able to stay away from "chemicals" since that Insecticidal Soap is a "chemical". The water you apply to your garden is a "chemical".
Water is a chemical?
Absolutely. What is water composed of?
Uhhhh..I never thought about it