you know you don't actually need napalm or petrol or expanding foam or anything.
to get rid of a wasps nest you only need two things
a big stick and legs.
late at night or pref when its raining heavily take big stick and give the nest a damned good whack making sure to crack it open.
then run like a loon
come back a few hours later and i guarantee it'll be gone. wasps who have their nest destroyed pick up and move on sharpish. best way really as then they can still eat all the garden pests.
must admit i did this a few years ago when we had some nesting in our back garden, it was raining and i was pretty well covered, and i started pulling apart the paper/card that had been left and what they were building their nest in (should have sorted that card out sooner) turning bits over until at last i exposed the nest and broke it open.
up to this point there had been at best 10 wasps zipping about getting progressively angrier, when i tipped out the nest about a hundred took to the air in a brillaint double V formation and headed for my face... or so it seemed.
not ran that fast in a while! lol.
anyhoo several hours later all i was left with was some dead waps and some very pretty comb like structures made out of very delicate paper mache.