How to attract (if you already have them) & kill annoying Fruit Flies (they resemble Gnats!) - First, get rid of the source that brought them in or that is attracting them and then.... 1. Fill a cup with Rice Wine Vinegar 2. Add a few squirts of Dishwashing Liquid. 3. Sit it somewhere out of the way. They will all gather and eventually DIE or DROWN. Good Luck!