B.S.
Oh, girl! I got a trick for you. I learned this off of an internet post a while back, and it always works like a charm and it's grossly fun. (Sorry.) Ok. Buy some beer if you don't have any. You can buy the cheapest kind possible if you want. Poor some in a small, wide mouthed glass about 3/4 the way up. Dump some dish soap in it (about a tablespoon) and stir it up. Leave it where the gnats linger over night and you'll have a cup full in the morning. I was amazed once by how many fell for it... the little drunkards!