This is the time of year moving forward that you start to notice a fly that is big and slow. These flies are so slow you can almost go up and pick them off the wall. These flies are called cluster flies. They linger on the sunny side of your home or building and when the weather gets cold they find whatever crack or crevice they can find and come inside.
So what do you do when they are inside. These ugly flies are best controlled with a vacuum hose. This is more environmentally friendly than sprays.