Can someone please tell me if they know if there is an essential oil to deter flies coming into my house as soon as I open the door or window. I am going absolutely mad as I have never had this problem before and hate using fly spray! I have wrecked my brains thinking what the cause could be and the only thing I can think of is the next door neighbours garden is an absolute mess. He has an old pigeon house which I have yet to see him clean and a dog that barks non stop. Thankfully I am moving within a few weeks so any suggestions would be very much appreciated