Does any one have a good recomendation for fly spray? I just tried to go for a walk and was swarmed (not joking) by deer flies. It looked like a sceen from the movie The Birds except with flies. I don't ever remember them being this bad. I should note that i had sprayed down with deep woods off and was still getting bit through my shirt. They were so thick it looked like a gnat swarm only larger flies.