Residential Price per Pane

I know many of you simply look at a house and estimate how long it will take to clean and boom, there's the price you're going to charge. I'm posing this thread toward those of you who take a more "scientific" approach by actually counting the windows. I know there are different factors that could cause your pricing to vary like if there's a 7 foot tall bush immediately in front of the windows. Let's pretend you're in the run-of-the mill cookie cutter subdivision full of newer homes that can be found anywhere in America. On average, what do you charge for in/out pricing per pane of glass (so 2 panes of glass per double hung window just to be clear). I'm not talking storm windows or anything difficult. It's been 5 years since I last worked for a window cleaning company, and I think we charged $4 per pane for in/out which seemed low even at the time.

from Window Cleaning Resource http://windowcleaningresource.com/vBulletin/residential-window-cleaning/39050-residential-price-per-pane.html

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