Your best bet would just be to buy the majority of it such as the traditional tools, cloths and scrapers and such from an online shop that is focusing on window cleaning such as cleaning spot. For sill cloths you can probably just use old rags or t-shirts and the liquid from any supermarket. For ladders your best bet would probably be somewhere like B&Q. If you are going to be using the water fed pole method then I think you will have to get everything online either the same site I mentioned before or something like Pure freedom.