Once the flies are no longer just a nuisance but to become a nuisance in the roller shutter box of the living room, I have resorted to Bayer special spray. After application by the book of fly strike had come to an end. Although the effect lasted longer than the specified six weeks, I regret to grab every few months to spray, but trust since the Bayer special spray.
(Note for cleverness Meier: The cause of the flies in the roller shutter box are by no means dead animals, as you can read in various forums It's such a simple ideal conditions due to the orientation of the house and a rural residential area..)
