What does this type do at night? Bed down in their hole?
Brake parts cleaner kills wasps and hornets better than wasp and hornet spray. I know it’s a miserable thing to be spraying around the environment, but it doesn’t leave residue like the bug killer does either.
I’d wait til night time if they all go to sleep there. Then put the red tube on the can, get it down in the hole pretty good and basically just try to fill the hole with fumes.