I had a terrible time with those flies earlier this year. Couldn't use sprays because my foster son has asthma--besides you have to spray them directly to kill them :| I tried the vinegar (both cider and white), didn't work. Fly paper only caught a couple -- most of them were smart enough not to lite on the sticky part. Someone told that if you put a penny in a cup of water that would get rid of them. Supposedly this is what they do in restaurants...I tried it--the flies disappeared but I don't know if it was the penny in the cup or all the other remedies I was using... :roll: