Kill gnats, fruit-flies, black-flies... Pour equal parts Apple Cider Vinegar and Warm Water into a small dish, add 8-10 drops of dish soap (we used Dawn-blue), stir to combine. Set-out near an area where the flies are feeding (away from children and pets)!
I poured about a half of a cup of apple cider vinegar into a small mason jar with about two squirts of dish detergent. I then took a piece of parchment paper or you could use wax paper to seal the mason jar. I then poked holes in the paper with the tip of a pen. This works amazing!! I caught more than three quarters of the fruit flies in my kitchen in less than 24 hours!