Hi guys. Never asked anything on a forum but I have a question that I cannot find the answer to. In outside Memphis Tennessee area I have put glass hummingbird feeders out for 4 years but this year I am finding about 10-15 house flies in reservoir of feeders. I take down weekly and scrub with hot soapy water and spray the reservoir and feeding ports with hydrogen peroxide and rinse before refilling. Never had a fly in there before so I got all brand new feeders, and it is still happening. Does anyone know why and what I can do? Any help would be appreciated.