You can also try fly predators. People use them in the stables is a natural way to get rid of flies, what is also nice is that the predators actually eat the maggots.
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I tried this and it didnt work at allI make my own fly traps out of old pop bottles. I lop off the tops of them at the top edge where the label ends. I flip the top upside down into the bottle. I fill the inside with a mixture of sugar, apple cider vinegar, and a little floral scented dish soap. The flies go into the trap... and cant get back out. When it gets full I just throw it away. It WORKS REALLY WELL!!
It also works on bees and wasps too. And because its non toxic I don't have to worry about the birds being poisoned.