Having a clean roof and a clean building exterior is good business. It can be part of your marketing strategy, as in “tidy inside and out.” Having a clean building exterior will make your clients and your tenants happy, but it looks good. And you will be happier, too. More on building cleaning: https://www.rotban.ca/services/building-cleaning/ siding cleaning: https://www.rotban.ca/services/siding-cleaning/ and how does “soft washing” for exterior cleaning work?: https://www.rotban.ca/blog/how-does-soft-washing-for-exterior-cleaning-work-2/