Posted 10/29/2017 11:30 (#6333378 - in reply to #6332841) Subject: RE: Flys swarming our house ... help
North of London
Agree. cluster flies!
If you do not use insecticide, like we do not, then it is just a case of cleaning them up.
We use sticky tapes on windows and vacuum and sweep and swat.
Only lasts for a while in the fall and again on sunny days in the spring when they try to find their way out again.