That old saying about catching more flies with honey than with vinegar is clearly false. Fruit flies are just beginning to make an appearance in my kitchen and this is my tried and true method for keeping them under control. Place an inch or so of apple cider vinegar in the bottom of a quart jar. Add two or three drops of dishwashing liquid and swish it around to mix well. Make a paper cone with an opening at the tip just small enough for the flies to get through. You want the top wide enough so it seals the top of the jar. Set it on your kitchen counter and watch it work. The flies fly into the jar, but can't figure out how to get back out the small hole. Put a fresh solution in every couple days. It's not particularly attractive, but it does the job.