This is a service you can include in a commercial office cleaning business, but it can also be an inexpensive and profitable business to start.  There are window cleaning wands that reach 3 stories, so ladders and rigs are not required. – You can also sign contracts for this service and establish a monthly budget. Store front businesses usually just require the outside of their windows to be cleaned. But homes and offices require both sides of windows, as well as the screens.