There is no continuity to the number or location of windows that Bluto muddies. When he starts cleaning, there are only 3 dirty windows on each floor, even though he sprayed dirty water on 4 windows of each floor. Once Popeye goes out to clean windows, there are 8 or 9 windows across each floor that have mud on them.
When Bluto is washing the windows and gets to Olive's floor, there are 3 dirty windows. From the inside, when Popeye is getting water out of the water cooler to wash the windows, there are only 2 dirty windows, and they are not in the same place as seen from the outside.