UPVC Windows Repairs uPVC (Unplasticized Polyvinyl Chloride) is a low maintenance construction material that will give your home energy efficiency and elegance for a long time. However, these windows require maintenance and care periodically. Clean the frames and cladding down with a soft, clean cloth to remove dust and dirt. https://www.repairmywindowsanddoors.co.uk/harrow-windowrepair/