Can anyone help me out. We have a problems with flies in a room in our house. They are around the window. The house is double fronted victorian with sash bay windows. Front is south facing. Nothing downstairs, just one of the upstairs bedrooms (on the front), sometimes getting them in the other bedroom (also on the front). Both rooms have open fireplaces but the flap thingy is almost closed (not sealed). Have tried taping the windows but the buggers are getting in somewhere. The room was decorated in October, everything cleaned out and no food etc has been left in there. A friend reckons there could be a birds nest close by? They are driving me batty - 5/6 a day!