My wife does domestic cleaning and there is a market for it i.e eot window cleans, the problem is a lot of window cleaners will not do one offs, I will but just make sure I charge a decent rate, and I would happily do work with local cleaning company's but I know most window cleaners would not. I am interested in this subject because it is an untapped market in many places, but to be cost effective the price has to be higher than the going rate unless it is where I am already working .
I dont know how many eot cleans you do a week but I could certainly fit a fair few in but as I say it would be at a premium price and if the cleaning company wrote that into their quote it would not be a problem, but if the cleaning company turns up and quotes 12-15 per hour and I quote a set price that seems higher to the resident it does not really work
I am waffling on here and probably haven't helped you but I am interested in this and would like your feed back, and in the mean time someone in your area might read this and offer their services, and if that doesn't work maybe we will tell you how to clean a window