They are horrible. Is there a way to convince them to go away? We have 2 ducks and their house is hosed out daily and for ducks, they are pretty darn clean. But we live between 2 pastures with a few horses and around farm land. So fly central. I have a lovely yellow sticky thing hanging over my sink. Lovely. Another hanging outside the back door and a sticky tape on the screen door out back. What I really really really want... to keep the flies off my screen door so they don't all come in when I try to go out. If we have the slider closed, no flies, but it is nice out, want to have the door open and the cooler air come in. But that means flies all over the screen waiting to invade. How do we persuade them to stay away??