Commercial window cleaning. Any tips or tricks

[Sunrise]

All shop fronts are different sizes so it depends on size of windows, number of transoms/mullions, difficult to get to high areas, how many you have in a row or very close to each other, are you cleaning the signage as well, frequency of clean, under cover or exposed to the elements, parking, where you are in the country (social/price divide and probably a few more that slip my mind. Don't waist your time, you can make a good living just cleaning 3 bed semi's.

Thanks for your reply, I have changed tack since hearing from you guys and I'm gonna go all out for residential now.