Why would you want to be anything other than just the window cleaner?.
I just find cleaning windows all the time drives a man into depression or drives you crazy. One day window cleaning and then one day doing add-ons. Flexibility is the reason I have loyal customers. Did a gutter clear, SFG clean and first clean on windows this morning. Started at 9am finished for 12.30pm and made £300 plus I have the monthly clean. Can only do it because I have Vac, Nano Trolly, Hypo and van system with 25' pole as I wasn't allowed to go on roof. Wouldn't have went on roof anyway, it was a new slate roof. The window cleaning gives me continuity with my customers who come first above everything else and they provide the add-ons, I see it as a win win situation. The reason Bungle is upset is because he may only do window cleaning, if on the other hand he does add-ons then he might have been able to fit something in. Happens to me and I finish earlier so I visit B&Q and buy material for a job I have booked that month. I believe the answer we have all been looking for is flexibility, add another skill to your bow and more money will come in. If you are happy just cleaning windows then so be it, its a free world so they say.