UPVC Windows Repairs uPVC, also known as Unplasticized Polyvinyl Chloride, is a low-maintenance material that will provide your home with years of energy efficiency and design. These windows require attention and maintenance. Wipe down the frames and cladding with a soft cloth to get rid of dust, dirt, and grime. http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1199659