HiI have been asked by a potential customer to clean their windows on a converted church. The main atrium is glass but the other windows are perspex. He said that he had someone in who put a product on the perspex which brightened and made the perspex slightly clearer (he called it a moisturiser!). He said that it did improve the look and the clarity and wanted to know if we could provide a clean on a quarterly basis. Has anyone had experience of such a product? If so is it easy to use?Many thanksTim