S.C. Code Ann. § 56-5-5000: Windows unobstructed; windshield wipers.

No person shall drive any motor vehicle with any sign, poster or other nontransparent material upon the front windshield, sidewings or side or rear windows of such vehicle which obstructs the driver's clear view of the highway or any intersecting highway. The windshield on every motor vehicle shall be equipped with a device for cleaning rain, snow or other moisture from the windshield, which shall be so constructed as to be controlled or operated by the driver of the vehicle. Every windshield wiper upon a motor vehicle shall be maintained in good working order.