Osha Clean you really need to go back into estate agency work.
You havent solved a problem, you are in fact creating more problems for yourselves your customers and any window cleaner who registers.
Now, i have an idea how about when you put someone's property up for sale you clean the windows every week for them until its sold. Sparkly clean windows will always make a house sell better, and for the 1st time ever estate agents will have actually done some work to deserve the extortionate fees they charge.