I have wasps going in and out of my house between the bricks. Mybil told me to use a hose, spray them(one at a time) with water so that their wings will get saturated. They won't be able to fly and will drop to the ground. Then you'll have to stomp on them.
It actually worked. My deck is full of bodies and ants are removing them. I did use some kind of spray but it didn't do a thing so I tried this. Mind you, it's time consuming. I did not get stung and must have killed between 50-60 wasps.