Nilco UPVC Window and Door Cleaner 480ml 5 "It Really Works!" Michael 28 April 2014 I used this product for the first time today. I have a long section of uPVC material fitted to the top of a brick storeroom. The uPVC had become almost green with a build up of moss type material over the years. It took a lot of elbow grease, but this product cleaned all the dirt off and left the uPVC looking like new. Plastic garden furniture next I think!