Ottawa Building Service (OBS) is your premier destination for professional window cleaning in Ottawa, located at 440 Laurier Ave. W., Suite 200. With over 20 years of experience, we specialize in comprehensive window cleaning services for commercial, high-rise, and residential properties. Our team of expert window cleaners uses eco-friendly, chemical-free solutions to ensure streak-free transparency and safety. Whether you need high-rise window cleaning for your office tower or a simple residential window cleaning, OBS guarantees top-tier results across Ottawa and surrounding areas. Reach out today for unparalleled service and let more natural light brighten your spaces!