Exterior Mold & Mildew Removal for Concrete is one of the jobs we do most often in Williston, ND. Typical jobs cost $250-$700, and you approve the price before we begin. On concrete, the method we use is pressure wash with a surface cleaner.
The right method for the job
Cleaning solution: A degreaser for oil spots and a pre-treatment for organic growth; post-treatment slows regrowth.
What to know about cleaning concrete
Plain broom-finish concrete is the surface pressure washing is made for. A rotary surface cleaner gives an even finish without the stripes a wand leaves, and hot water helps with grease and oil.
Avoid: Holding a narrow tip close to the surface, which etches lines into the cream layer of the concrete.
How often: Every year, or every 6 months in shaded, damp spots.
When to book exterior mold & mildew removal for concrete
- Black, green or gray spots and film
- Slippery walkways and decks
- Musty smell near shaded walls
- Growth that returns soon after rinsing
Why it gets dirty
- 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
How we handle exterior mold & mildew removal for concrete
- 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.
Exterior Mold & Mildew Removal for Concrete cost in Williston, ND
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 concrete
- Pressure Washing for Concrete
- Driveway Cleaning for Concrete
- Sidewalk & Walkway Cleaning for Concrete
- Patio Cleaning for Concrete
- Pool Deck Cleaning for Concrete
- Concrete Sealing for Concrete
- Rust Stain Removal for Concrete
- Oil Stain Removal for Concrete
- Graffiti Removal for Concrete
- Gum Removal for Concrete
- Efflorescence Removal for Concrete
- Commercial Pressure Washing for Concrete
- Parking Lot & Garage Cleaning for Concrete
- HOA & Apartment Pressure Washing for Concrete
Exterior Mold & Mildew Removal for Concrete in Williston, ND
In North Dakota, 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.
Crews serve all of Williston (ZIP codes 58801, 58802 and 58803), plus Watford City (28.4 mi), Sidney, MT (38.8 mi), New Town (53.3 mi) and Stanley (57.7 mi). Call (555) 010-0000 for a free quote in Williston.
Exterior Mold & Mildew Removal for Concrete: frequently asked questions
How much does exterior mold & mildew removal for concrete cost in Williston, ND?
Exterior Mold & Mildew Removal for Concrete 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 concrete?
For concrete: usually 2,500-3,500 PSI with a rotary surface cleaner for even results. What we avoid: holding a narrow tip close to the surface, which etches lines into the cream layer of the concrete. We keep the pressure even and controlled, with the right tools for the surface.
Is exterior mold & mildew removal for concrete 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 concrete?
Every year, or every 6 months in shaded, damp spots. 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.