Mildew or mold on exterior paint — Dordrecht, South Holland
Dark green, gray, or black splotches on exterior-painted surfaces — siding, trim, soffits, and window frames — are usually mildew or mold growth on the paint film itself. Mildew thrives on north-facing walls, shaded areas, and surfaces near sprinklers or dense landscaping where moisture lingers. Unlike dirt, mildew is organic growth that feeds on the paint's binder and won't wash off with water alone. A bleach solution test confirms mildew: apply a few drops of household bleach (1:10 dilution) — if the spot lightens within 1–2 minutes, it's mildew; if not, it's dirt or staining. Professional pressure washing with mildewcide ($200–$600 for a typical home) removes existing growth, but repainting with mildew-resistant paint ($40–$60/gallon) is needed if the paint film is degraded. Prevention: trim vegetation 12–18 inches from walls, redirect sprinklers, ensure gutters don't overflow onto siding, and use paint with built-in mildewcide for shaded exposures.
Why this is common in Dordrecht
The damp river climate shortens exterior paint cycles, and listed-building facades in the protected cityscape require approved colours and traditional linseed-based methods; interior repaint demand is concentrated in the post-Rotterdam buyer cohort upgrading older Dordrecht houses room by room.
Who to call
For this problem in Dordrecht, call a: Painter
Find a Painter in DordrechtSymptoms to look for
- Dark green, gray, or black splotches concentrated on north-facing or shaded walls
- Discoloration that spreads gradually over weeks or months (unlike splatter or staining)
- Spots lighten when dabbed with diluted bleach (the mildew test)
- Musty odor near affected exterior walls, especially after rain
- Paint underneath the mildew appears soft, chalky, or degraded when wiped
Emergency Service in Dordrecht
Emergency services in Dordrecht respond within 25–55 minutes across the island city and the wider Drechtsteden (Zwijndrecht, Papendrecht, Sliedrecht). Emergency rates run €70–€160 for callout plus €65–€120/hour including BTW — modestly below Rotterdam and well below Amsterdam.