If you try the vacuum, put some Tide or other detergent with enzyme and water in the bottom of the vacuum. ( I am guessing you would use a wet/dry vac. ) The enzyme kills them and neutralizes the scent released when some stinging insects die.
I had a nest of some kind of small black and yellow bees under my aluminum siding right next to the front door. I rigged a 6 gal. Shopvac nozzle right where they were coming out and started it up just before dawn. A few hours later I had about a 1" deep by 10" diameter layer of bees floating in the vac. I did this again 3 days later and didn't see any more bees around there the rest of the summer.
I had a nest of some kind of small black and yellow bees under my aluminum siding right next to the front door. I rigged a 6 gal. Shopvac nozzle right where they were coming out and started it up just before dawn. A few hours later I had about a 1" deep by 10" diameter layer of bees floating in the vac. I did this again 3 days later and didn't see any more bees around there the rest of the summer.