There's No Fixed Rule for Every Home
Unlike a routine maintenance task on a strict calendar, exterior house washing frequency depends on what's actually happening to your siding: sun exposure, shade, tree cover and humidity all play a role.
Signs Your Siding Is Overdue
- Green or black streaking, especially on north-facing walls
- A dull or dingy look compared to a freshly cleaned section
- Visible pollen film that doesn't wash off with rain
- Mildew spots near gutters, soffits or shaded corners
Why Some Homes Get Dirty Faster
- Shade and tree cover: Less direct sun means more time for algae and mildew to take hold.
- Humidity: North Carolina's humid stretches, especially in summer, encourage organic growth.
- Pollen season: Spring pollen can coat siding heavily in a short window.
- Proximity to sprinklers or gutters: Consistent moisture on one section of siding speeds up staining there specifically.
What Method Should Be Used
Most siding is a candidate for soft washing rather than high-pressure cleaning, since the goal is removing organic buildup without risking damage to paint, caulking or siding seams. The pressure washing vs. soft washing guide covers which surfaces need which method.
A Reasonable Starting Point
Many Greensboro homeowners find that once a year, often after spring pollen season, covers routine buildup. Homes with heavy shade or tree cover may need attention more often, while homes in full sun with little tree cover may go longer between cleanings.
Pairing House Washing With Other Projects
Washing the exterior is a common first step before exterior painting, since paint needs a clean surface to adhere properly. The best time to paint guide covers how washing and painting timing fit together.
Not sure if your siding needs washing?
Send a few photos of your exterior and Trashout will let you know if it is ready for cleaning.