dang flies !!!

Two things that I know work are ultrashield spray and quick strike bait stations.

Ultra shield is weather proof fly spray in a black bottle. Get ready because it is about $20 per bottle, but it is the only product I have ever found that works just like they claim. It says it works for 17 days, and it certainly has worked that long for me. Apply to ears if that's where you are having problems.

Quick strike bait station is a plastic grid with a pesticide and attractant inside. Hang it up about 4 feet off the ground and watch the fun. Flies are attracted to it, and within a count of five are in their death throws on your floor. It doesn't create a stink like those fly trap bottles and bags. The only issue you will have is needing to sweep away the pile of little fallen flies under the quick strike.

Cheers
M