marketing is about understanding what the customer wants from your service and then showing those things in what ever your marketing is. ask yourself what those things might be. better yet ask a few customers. I much prefere to come up with my own idears instead of copying someone elses.
window cleaning is a simple thing and is largely still a very underserviced industry, some guys like a very simple and to the point leaflet, i started this way myself, now we have an A3 folded full colour brochure with as much info pics and so on as we can squeeze in. do what feels right for your business and the stage you are at.
Lee Pryor