I just moved into this apartment in October and in November we noticed gnats in the office, bedroom, and bathroom but we don't know why they are coming in. We pour bleach down the drains once a week and we don't have any fruit or veggies at all. But they seem to be taking over the office area in the closet, on windows, walls, and even the doors and frames. I have vinegar traps set and they worked for about two weeks and the gnats are back. What can I do?