Originally Posted by cincinnana

I use Dawn or similar as a sticker( substance to break water tension and make product stick to plants/insects) with insecticides and fertilizers and weed killers.
It does work and will work on any plant including your banana plants

Common cooking oils work fine as long as you follow the recipe.
There is also a great Neem oil recipe out there also.

A great source of homemade stuff that usually works is published by a fellow named https://www.jerrybaker.com/tips-and-tonics.

There are a lot of great recipes out there on the web.

You can use common household materials and you will see results and save some money too .