Apple Cider Vinegar Trap

Pour about an inch of apple cider vinegar into a small jar or bowl. Add 2-3 drops of liquid dish soap (this breaks the surface tension, causing flies to sink). You can optionally cover the top with plastic wrap secured by a rubber band and poke several small holes in the wrap. Place the trap near where fruit flies congregate (e.g., near fruit bowl, sink drain, trash can). The flies are attracted to the fermented scent of the vinegar, fall in, and drown.