how to get rid of wasp nest in cavity wall?

vax2002

some nests can be 30-40 years old.
They nearly always have more than one way in and out.

sirbrainy

Rentokil wasp nest foam destroyer- Tesco
Whilst doing my weekly shop, came across the Rentokil wasp nest foam destroyer in my local Extra store reduced from £3.00 down to 18p per can.
Bought a couple of cans and put them away for next spring. I found them on the cleaning product aisle.

https://forums.moneysavingexpert.com/discussion/3507457