Wasps n hornets have an oily body to repel water. This is so they can breathe through their pores.
The dawn strips the oils, and the water coats their bodies suffocating them. It also weighs down their wings preventing flying.
It's best done at sunrise before they are fully active.
hmmm interesting, so you just mix this up? how much dawn? and then throw it on them?
I Got nailed by a hornet from a nest I had planned to leave alone.
Got some Hornet spray, donned myself in a heavy winter coat, toboggan, Divers face mast (yes) and stood back away the next evening.
Gave it a good squirt esp at the access hole.
Man, they came pouring out and dropped straight down. Not one could fly.
The spray is amazing. Highly recommend it.