Re: Cluster Fly
I had a problem with fruit flies lately and used advice on here form Steve I think which worked a treat. It was to put some vinegar into a glass and cover the top with cling film. Then you have to pierce a few small holes in the top of the cling film.
I used to swirl the glass around every few hours and I think it must have sent the vapours upwards to attract more flies to their death!
Good luck with it.