I have just had new PVC windows installed and there seems to be some sort of scummy marks on the glass, it's like grease or something. Everything I have tried to clean the glass with just seems to wash over the scum and I have tried everything I can think of. Any ideas?
Contact your installer and tell them your problem, could be a manufacturing defect.
By
07/28/2010
This works for me every time, first wash the windows with warm water with a few drops of dish washing detergent in it. Then while the window is still a bit damp but not dripping with water use kitchen paper and white vineger to polish to a sparkling finish. To be even more frugal newspaper works well for the polishing stage too.