I do not remember who it was presented the advice on stink bugs on citrus. it was very interesting, but seemed rather time consuming.
I have found that adding finely minced stink bugs to the soapy water makes a lovely goo that can be sprayed on with a coarse spray. I bought an old electric mincer especially to do the job. it is 100% successful.
I do not know if this is the right place to offer this information.
(Isobel) Wendy Erickson