cluster flies in house

Cluster Flies in House: Stop Cluster Flies

You notice them first on a bright window. One or two at the start, then several more, all slow-moving and oddly dozy, as if they've appeared from nowhere. If you've got cluster flies in house, that pattern is familiar. They gather where the light is, disappear into lofts and voids, then turn up again just when you think the problem has gone. Most advice stops at “seal the cracks”. In real...