Hey guys So thought I'd clean my own house yesterday. It is bloody filthy the frames the windows frames sit in are metal, painted white which are Flakey but the actual window frames are upvc. Anyway mu technique was spray brush head with ubik, scrubbed whole frame, then concentrated on the top of the frame and window rubber, rinsed then allowed to dry, moved onto the next and done same thing. Then back to first window and scrubbed glass only then rinsed. Being new and very cautious I did use about 10 litres in total on this double window. Way ott some would say. Anyway the window almost looks worse than before. Loads of spotting and misty look. Any thoughts guys?