Who to call · Hilversum
Green algae or mildew on siding — Hilversum, Noord-Holland
Green or black streaks on vinyl, wood, or fiber-cement siding are usually algae (Gloeocapsa magma) or mildew colonies fed by moisture and shade. Left alone they trap moisture against the surface, accelerating rot in wood and degrading paint. A professional pressure washing ($200–$500 for an average home exterior) removes these growths in 2–3 hours using a soft-wash technique — low pressure (under 1,500 PSI) with a sodium hypochlorite or oxygen bleach solution that kills spores without damaging siding. Standard high-pressure washing can force water behind siding laps on vinyl and splinter softwood grain, so soft-wash is the industry standard for building exteriors.
Who to call
For this problem in Hilversum, call a: Schoonmaker
Vind een Schoonmaker in HilversumSymptoms to look for
- Green, black, or dark streaks on siding that don't wash off with a garden hose
- Siding feels slimy or slippery to the touch in shaded areas
- Discoloration worsens on north-facing walls or under trees
- Musty outdoor smell near the house foundation
Related services in Hilversum
Not sure which service?
Pressure washing vs deep cleaningPressure washing vs exterior paintingCarpet cleaning vs pressure washingPressure washing vs house cleaningPressure washing vs handymanPressure washing vs painter for exterior refreshGutter installation vs pressure washing for exterior drainageWindow cleaning vs pressure washingGutter Cleaning vs. Pressure Washing: Which Do You Need?Soft washing vs pressure washing