What to do when summer swarms attack

Even sheltered in its Latin name, musca domestica, there’s nothing I can say to defend the character and deportment of the house fly. Break-dancing over foodstuffs, eagerly exploring the crevices of the human face and playing a demented insect Icarus with the light bulbs — few care if his six feet are trembling on a fragile lever in the natural ecology.
Nibbling rubbish, carrion, faeces — they cheerfully regurgitate their meals, track germs, and glue down tiny droppings everywhere they go.