The safest and most effective roof cleaning approach uses low-pressure washing with appropriate cleaning solutions rather than damaging high-pressure methods. For asphalt shingles and tile roofs, professionals typically apply specialized cleaners containing algaecides that remove biological growth without eroding surfaces, then use gentle rinsing rather than abrasive pressure. Metal roofs can tolerate slightly higher pressure but still benefit from appropriate cleaners rather than force alone. DIY cleaning poses significant injury risks from falls, potential roof damage from improper techniques, and exposure to harmful organisms in accumulated debris. Professional services typically include preventative treatments that slow future growth and comprehensive gutter cleaning as part of the process. This investment typically pays for itself through extended roof life and improved curb appeal.
