Fed up with spraying every hour or so and combined with the need to keep the doors closed for the spray to be effective means that it can be quite unhealthy as well as expensive in terms of fly killer sprays.
A neighbour who also suffers with these pesky things advised me to get one of these.
https://www.amazon.co.uk/gp/product/B01 ... UTF8&psc=1
Bloody marvellous things not only can you take revenge they also give a reassuring crack and spark as the little buggers make contact with the mesh.

So I now look forward to the sods arriving as not only do I get to breath clean air, such as it is in London, but I also get exercise too,bit like a Nintendo tennis thingy, and it is possible to fry the big buggers a couple of times as they stick to the racket!!
Revenge is a dish best served cold.

I now get pro active and can be seen dancing round the patio like a demeted Wimbledon finalist, the neighbours must think I have lost the plot!
Bliss
I have bought one for the Bongo too!