That is very likely the worst example I've ever seen on how to clear Hornets, doing it the way guy in the video is doing is nothing short of criminal, Hornets stings are bloody bad...and all he's doing is putting at risk anybody who lives nearby.

The BEST way is to go around the building and seal any gaps or better still totally enclose it in a tent like structure...basically you wrap it in something like heavy duty cling film...once that's done you simply pump in the aerosol poison and kill ALL the nasty feckers in one go...simple, efficient, and relatively cheap.

#1 Doesn't look like anyone but the owners live nearby.

#1 That would leave a enormous amount of dead wasps inside the walls and ceiling, attracting other animals and bugs to come and eat. You would have to open the walls and clean them out thoroughly. Poisonous removal should always be the last resort. Best thing would be to dose them with some sedative smoke and catch the majority along with the queen and relocate them somewhere far away. Whatever wasps are left behind after the queen has left will either die or move to other locations.
I do however agree that if it was just a nest hanging visible, the best approach would be to clip the nest off inside an airtight bag and leave them to die there, or spray as well, and then dispose of it properly. But as you see the size of this nest isn't small enough to just put in a bag, so extreme measures has to be taken. Also, if one does it calmly, the wasps should in theory not be as aggressive as if you kill or swat one of them, as they release a chemical when they die to alert the rest.

Those are about the four longest minutes I have spent at Snotr And yes, agree about aggressive means being the last resort.

With a massive wasps nest in the attic, I fitted a large funnel to the hose of a vacuum cleaner and sucked them out. The killer aerosol was squirted in at the same time via the pressure sliding hole in the hose handle, and then a bag full of dead wasps emptied into the dustbin. Repeated half a dozen times.....

The Manhattan of hornets.