According to UC Davis ipm site, insecticidal soap is acceptable, but they said it is better to clear the host plants and encourage beneficial insects.
I don't really have a stink bug problem. I have planted fennel, dill, marigolds, onions, nasturtiums, borage, and sunflowers throughout the garden and they do a good job of attracting may of the beneficial insects. I think that maybe some of the birds are probably also eating some of the insects when they are not busy eating the strawberries, figs, and tomatoes. The mongoose also eats all kinds of grubs diving into the mulch. I have found a few stink bugs, but I pick them off and put them in the bug ziploc bag I bring with me into the garden every time I go out to water or work in the garden. I did have a problem with the leaf leg beetles, at my other house, but we lived on a perimeter lot with a ravine behind us, so I had to put a bug net over the garden to protect the plants and it worked as long as I could keep them excluded.
https://www.ipm.ucdavis.edu/PMG/r783300211.html
