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Locate their hives, and then wait till after dark when the wasps are all inside the hives, and then spray each hive thoroughly with a good wasp and hornet spray. If you use a good wasp and hornet spray, they will all start to die immediately and you don't have to worry about them flying out of the hives and attacking you. You might want to buy more than one can of spray, depending on how many hives you have.
Caution:
For daytime and individual hornets, I learned that when you squish wasps/hornets, they release a pheromone (scent) that calls for others to come to their defense. Yikes. Put out a deep jar with honey in the bottom. The leftover wasps/hornets will catch in the bottom.
Spraying insecticide at night in their nests is a good idea.
I just "terminated" a 6 inch diameter nest under construction beneath my eave. I waited till midnight then using my expanding hose with a spray bottle nozzle device connected to it, filled it with clorox and hit the nest with a heavy jet of water & bleach! In a few minutes the paper ball was blown away but the comb core took a bit more effort to break it's "anchor" off the ceiling before it fell to my deluge. No counter attackers, no noticeable debris, the whole thing was over in about 15 minutes! Back to bed I went (but not them!)
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I can't even go onto my back porch without killing at least 5-10 wasps in a half hour period. I see a lot of them are going up into the porch roof though any means they can.
I need a good old home remedy for wasps. (The removing of them.)
