A customer of mine had a wasp nest in the muck heap at their stables. They thought that taking the hose to it would drown the wasps and eradicate the nest.
It didn't and they were stung. Turning the hose on to wasps makes them aggressive and this can be very dangerous especially if you are not wearing PPE.
Three Counties Pest Control have the expertise, PPE, equipment and range of professional insecticides to deal with any nest.
Price: £70 No VAT
Removing a wasp nest can be dangerous without professional help. For safe wasp nest removal Toronto, check out Pesticon.