For most homes, the answer is straightforward: once a year. That single cleaning handles the normal accumulation of dirt, pollen, road grime, mildew, and the algae that loves to grow on shaded siding. But "once a year" isn't a rule — it's a baseline. The right cadence depends on what's around your house.
When Annual Cleaning Is Enough
A typical single-family home with average tree cover, normal sun exposure, and no major moisture issues gets the best results from one professional exterior cleaning a year. That includes a soft wash on the siding, gutter exteriors cleaned, and the front-walk and driveway hit with pressure.
When You Need to Clean Twice a Year
- Heavy tree cover: leaves, sap, and bird activity speed up biological growth
- North-facing siding that stays damp: algae thrives where the sun doesn't reach
- Older paint or oxidized vinyl: chalking and surface degradation collect dirt faster
- Coastal, river, or pond proximity: humidity boosts mold and mildew rates
- You see green or black streaking returning within months of a wash
Signs You're Overdue
Don't wait for someone to ask if your house is okay. These are the visual cues that a cleaning is overdue:
- Black or green vertical streaking on siding
- A dark "tiger stripe" pattern on the face of your gutters
- Dull, faded-looking concrete driveways or walkways
- Green tint on north-facing walls or in shaded corners
- Algae or moss patches on roof shingles
- A noticeably darker color of your home compared to when it was painted or sided
Annual is a maintenance schedule. If you're seeing major staining, you're past maintenance and into restoration — that often means a more thorough treatment.
Best Time of Year
Spring is the most popular time to schedule, and for good reason — winter leaves behind salt spray, road grime, and overwintered algae. A spring wash sets your home up for the season. Fall is a strong second slot, especially for gutter exteriors and driveways heading into winter. Call (224) 789-0290 to schedule with H2O Power Washing.
