This stuff works.
Have killed bees with sprays, carb cleaner, br ape clean, gas, diesel, flames...
Kibosh turns them off like a light.
I wouldn't be afraid to stand under a nest being sprayed.
It's actually kinda scary.
The stuff hits them, they just turn off.
Not sure where to source it besides industrial supply places.
And it's expensive, I only use it where I really need them dead.
If it's somewhere that I can deal with a few cripples, the cheap stuff
is ok.