Va. Code Ann. § 46.2-1055

Every permanent windshield on a motor vehicle shall be equipped with a device for cleaning snow, rain, moisture, or other matter from the windshield directly in front of the driver. The device shall be so constructed as to be controlled or operated by the driver of the vehicle. Every such device on a school bus or a vehicle designed or used to carry passengers for compensation or hire or as a public conveyance shall be of a mechanically or electrically operated type. The device or devices on any motor vehicle manufactured or assembled after January 1, 1943, shall clean both the right and left sides of the windshield and shall be of a mechanically or electrically operated type.