Laura from Swansea writes
Maxforce Granular Fly Bait would not be our number one recommendation for Cluster flies in a home.
Installing a Paraclipse Insect Inn Ultra II Fly Light in attics and false ceilings is an effective approach to dealing with cluster flies when the overwintering site cannot be determined. When the cluster flies "awaken" in the spring, a fly light will attract and capture a large portion of the cluster fly population before they are able to inhabit living spaces. Please take a few minutes to read over our article entitled:How To Get Rid of Cluster Flies.
Answer last updated on: 02/07/2016