UPVC Windows Repairs uPVC (Unplasticized Polyvinyl Chloride) is a low maintenance construction material that will provide your home with energy efficiency and style for many years. These windows will need some maintenance and care. Clean the frames and cladding with a soft cloth to get rid of dust and dirt. https://www.repairmywindowsanddoors.co.uk/letchworth-windowrepair/