Thanks for the tips!When I do a first clean then I clean all windows 3 times. Firstly I scrub all the windows and clean above vents and inside vents then I go back and clean all the windows and frames. Usually clean the doors now with the pink stuff on any stubborn bits and complete a good rinse and check how they turned out. If still have stubborn bits then I scrub with pink stuff until I'm happy but only with white pvc doors. Lastly I go back and start cleaning the glass only and do a good rinse. It takes 30mins and I use alot of pure but I have never had any complaints doing it this way so it works for me. When you complete a first clean and the customer is more than happy then they will be happy from then on. If the opposite happens then the next clean they can be looking for faults to pull you up again. That's the reason I have resorted to the 3 clean method on first cleans because it works for me. ?