Some folks incorporate a "wetting" agent. A chemical designed to allow the water to break the little surface tension kinda bits.
I've used 1tsp/gal dawn dish soap as a wetting agent before. Worked well for me. I also use it when I mix up a batch of neem oil.
I've used 1tsp/gal dawn dish soap as a wetting agent before. Worked well for me. I also use it when I mix up a batch of neem oil.