this is me cleaning the roof of my house last year and yes i am using a vacuum cleaner [but what kind]Last year i had external insulation fitted to my house and while the scafolding was up thought i might as well clean the roof as well .The roof was thick with moss that had been baked in the sun when the moss comes away it falls into the gutters blocking them so after loosening it with a scraper on a long pole i tried sweeping it with a brush it was hopeless the stuff was flying all over the place and the dust was really bad so i decided to vacuum i coupled together two extra long Henry hoses and used extension tubes from various machines so that i could reach the top and i have to say it worked a treat

