How to get rid of this?
To get rid of an out of control fly situation, inspection is the first and foremost step.
There are more than 16,000 species of flies in North America. But they all belong to the order Diptera, meaning two wings. Because they only have two wings, flies land often and therefore can deposit thousands of bacteria each time they land.
There are many initial ways to deal with flies. A Flyswatter usually consists of a small rectangular or round sheet (some 4 inches (10 cm) across) of lightweight, flexible, vented material (usually thin metallic, rubber, or plastic mesh), attached to a lightweight wire or plastic handle about 1 foot (0.30 m) to 2 feet (0.61 m) long. Fly gun is a derivative of the flyswatter, uses a spring-loaded plastic projectile to mechanically “swat” flies. Fly bottle, Disposable fly traps,
Flypaper (also known as fly paper, fly sticker, fly strip, fly ribbon, or fly tape) attracts flies to sticky adhesive so that they can be trapped.