This Fly Repellent Really Works

For years I had heard about this simple fly repellent and seen it in restaurants and some people's homes, but hadn't bothered to try it.  After cleaning and cooking deer meat for several days we seemed to be chasing a lot of flies.  I think they're very attracted to proteins.  It's a simple matter of putting water in a plastic bag and hanging in the doorway.  We haven't had a fly in the house for over a month.  There are many theories as to why it seems to work, but all I know is it's Spring, in Texas...that means it really works, y'all.