Oh man, I do hate those fly sticky rolls that hang down from the ceiling. We used to have them on our outside back porch when we lived in Waterloo ... how many times I walked into one of those "suckers" have my hair stuck to one. Gross !!!! and then some ! Yech, yech, yech !!!
We get quite a few of these flies at our basement's back door window facing the Western exposure. There have been swarms of them at this location at times.
Last Year I had come across a fly catcher that gets placed on to the window (I am thinking I found them at the Co-op or TSC store).
Here is a link to some other helpful hints that might be of some assistance in the aid of ridding one's self of Cluster flies: http://www.howtogetridofstuff.com/pest-control/how-to-get-rid-of-cluster-flies/
I manged to get at our downstairs freezer today, which I might add is by the back "fly" door where I hadn't been bothered by one pesky fly. I didn't really have time to pull everything out and wash it all down as I had hoped to, however I did organize it better then what it was.