I use the sticky paper things and they work as well as anything could really. My paper will get dozens on it in a day but problem is their are just to many flies. You could kill 3/4 of them and still not feel like a difference has been made because the remaining ones are still a huge nuisance. I wonder where all the little buggers come from but then it doesn't help one two neighbors with chickens and another across the street with two carabao that go and sh*t everywhere. Its also not like you can find a place to move where you have clean neighbors who are also farm animal free.
I know how they get into my house, it's because everybody except me does not really know all the functions of a door, they open it stand in the doorway and talk to whoever is inside. I have explained the close function many times but it does not seem to stay in the memory bank very long, i even told them we would be as well taking all the doors off and using them for firewood but ....