I emptied the fruit bowl and binned every last banana just to be rid of the flies: four days later they were back, and I understood what the sink had been keeping
You threw out every banana, cleaned the counter, and the flies came back anyway. The real culprit isn’t your fruit bowl—it’s the biofilm layer thriving in your kitchen drain, a five-star nursery where hundreds of eggs hatch every four days. Here’s exactly how to break the cycle.