Hi Frogman
WE had a wasp nest in an outside garden wall, so late one night with a full length of plastic 25mm pipe, a 90 degree bend, large funnel and a lump of rag.
Plus can can of petrol !!!
We pipe 5 liters of petrol into the nest and as they tried to come up the pipe, we put the rag over the funnel.
Next today we have no wasps !!!
The fumes kill them as they breathe via they skin.
Canabus