The secret to exterior mold & mildew removal for stucco is using the right method, not the most pressure. In Portland, ME, we match the cleaner and pressure to the surface so it comes out clean without damage. For stucco, that means soft wash.
Method and pressure
Cleaning solution: A diluted house-wash solution with surfactant, given time to dwell, then a gentle rinse.
What to know about cleaning stucco
Traditional stucco is porous and holds moisture, which is why it streaks green and black in humid and shaded spots. Hairline cracks are common, and high pressure can force water into them or break off the finish coat.
Avoid: High pressure, which can etch the texture, blow out patches and push water behind the wall.
How often: Every 1-2 years.
Is it time for exterior mold & mildew removal for stucco?
- Black, green or gray spots and film
- Slippery walkways and decks
- Musty smell near shaded walls
- Growth that returns soon after rinsing
What causes the dirt and stains
- Shade, humidity and poor air flow
- Organic debris and pollen
- Surfaces that stay damp after rain or sprinklers
What you can do yourself
- Improve sun and air flow by trimming plants
- Keep gutters and sprinklers from soaking walls
- Clean small areas with an outdoor mildew cleaner, following the label
Not sure what you're looking at? The free stain identifier and safe pressure guide explain each stain and surface.
What can go wrong with DIY pressure washing
- Blasting growth off without killing it, so it grows back fast
- Mixing cleaning chemicals, which can release toxic gas
- Damaging plants with runoff
Our process for exterior mold & mildew removal for stucco
- Identify surfaces and growth
- Protect plants and fixtures
- Apply a solution that kills the growth
- Rinse at low pressure
- Post-treat where helpful to slow regrowth
This service is for outdoor surfaces. Mold inside the home, in attics or in wall cavities needs a mold remediation specialist, not a pressure washing company.
How much does exterior mold & mildew removal for stucco cost?
What moves the price:
- Size: square footage of siding, roof or flatwork
- Condition: heavy growth, old stains and peeling finishes take longer
- Access: number of stories, roof pitch, slopes and how close we can park
- Add-ons: sealing, gutter brightening and other services done in the same trip
These are typical U.S. ranges, not a quote. You get an exact price before any work starts. For a quick estimate, try the pressure washing cost calculator.
Other services for stucco
- Soft Washing for Stucco
- House Washing for Stucco
- Rust Stain Removal for Stucco
- Graffiti Removal for Stucco
- Pre-Paint Washing for Stucco
- Commercial Pressure Washing for Stucco
- HOA & Apartment Pressure Washing for Stucco
Serving Portland, ME and nearby towns
In Maine, snow and slush that sit against the house leave a band of grime and mildew along the lower siding, and shaded north walls stay damp long after the thaw. A spring soft wash removes winter grime before it bakes on over the summer.
Near the coast, salt air leaves a film on siding, windows, screens and railings that dulls finishes and speeds up corrosion on metal. Regular rinsing and washing help protect them.
Besides Portland (ZIP codes 04101, 04102, 04103, 04104, 04109 and more), we handle exterior mold & mildew removal for stucco in South Portland (1.4 mi), South Portland Gardens (3.1 mi), Westbrook (5.8 mi) and Scarborough (6.3 mi). Call (555) 010-0000 for a free quote in Portland.
Exterior Mold & Mildew Removal for Stucco: frequently asked questions
How much does exterior mold & mildew removal for stucco cost in Portland, ME?
Exterior Mold & Mildew Removal for Stucco typically costs $250-$700 for typical exterior growth on a home, and usually takes 2-4 hours. The exact price depends on the size and condition, and you get it before any work starts. Call (555) 010-0000 for a free quote.
Do you use high pressure for exterior mold & mildew removal for stucco?
For stucco: soft wash only, typically under 500 PSI. What we avoid: high pressure, which can etch the texture, blow out patches and push water behind the wall. The cleaning solution does most of the work, followed by a gentle rinse.
Is exterior mold & mildew removal for stucco safe for my plants and pets?
We pre-wet plants and lawns, keep cleaning solutions diluted to what the surface needs, and rinse landscaping again when we finish. Keep pets and children inside until surfaces are rinsed and dry.
How often should I schedule exterior mold & mildew removal for stucco?
Every 1-2 years. Shade, nearby trees, humidity and heavy traffic mean more frequent cleaning; sunny, dry spots can go longer. Our free cleaning frequency tool gives a recommendation for your climate.
What if it rains on the day?
Light rain doesn't stop most washing, but heavy rain, high wind, lightning and freezing temperatures do. If the weather isn't right, we reschedule at no charge. Our work is backed by a satisfaction guarantee.