noooooooooooooooo, dont do it, its hard work a right pain, places that you clean never have the right drainage etc, while a pressure washer is imo a great bit of kit to have on a personal level as a businness you will earn far more and not break you back by doing window cleaning. plus brushing the sand back into block paving is a right pain and you have to wait till its dry.. .i hate this type of work as much as builders cleans