The secret to deck cleaning for composite decking is using the right method, not the most pressure. In Saint Paul, MN, we match the cleaner and pressure to the surface so it comes out clean without damage. With composite decking, the right approach is low-pressure wash.
The right method for the job
Cleaning solution: A composite deck cleaner recommended by the decking maker.
What to know about cleaning composite decking
Composite decking doesn't need staining, but it does grow mold and mildew, especially in shade and between boards. Most manufacturers recommend gentle cleaning, and some limit the pressure that can be used without affecting the warranty.
Avoid: High pressure and narrow tips, which can scar the surface and may void the warranty.
How often: Every year, more often in shade.
When to book deck cleaning for composite decking
- Gray, weathered boards
- Green or black growth and slippery spots
- Stain that is peeling or worn through
- Dark spots under planters and furniture
- Mildew between composite boards
Where the grime comes from
- Sun breaking down the wood surface (it turns gray)
- Shade, leaves and moisture feeding mildew
- Old stain or sealer wearing unevenly
- Pollen and dirt trapped in the gaps
Easy upkeep between cleanings
- Clear the gaps between boards with a putty knife so water drains
- Sweep often and keep leaves off the deck
- Move planters and rugs now and then
- Check for loose boards, nails and soft spots before anyone washes it
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
- Furry, gouged wood and lap marks from too much pressure
- Water and grime blasted onto the house siding
- Using chlorine bleach on wood, which can damage fibers and fasteners
- Washing composite decking in a way that voids its warranty
What happens on the day
- Inspect the boards, rails and finish
- Protect nearby siding and plants
- Apply a wood or composite cleaner and let it dwell
- Rinse at low pressure, following the grain
- Apply brightener on wood and let it dry before any stain
Typical deck cleaning for composite decking prices
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 composite decking
Serving Saint Paul, MN and nearby towns
Decks and fences in Minnesota spend months under snow, and the short summer is the only window to clean and refinish them. Plan deck staining for a stretch of dry days above about 50°F.
Much of Minnesota has hard water. Sprinklers and misters leave white mineral spots on walls, windows, fences and pool tile, and those spots need a mineral-safe cleaner, not more pressure.
Crews serve all of Saint Paul (ZIP codes 55101, 55102, 55103, 55104, 55105 and more), plus West Saint Paul (2 mi), South Saint Paul (4.6 mi), Mendota Heights (4.7 mi) and Maplewood (4.8 mi). Call (555) 010-0000 for a free quote in Saint Paul.
Deck Cleaning for Composite Decking: frequently asked questions
How much does deck cleaning for composite decking cost in Saint Paul, MN?
Deck Cleaning for Composite Decking typically costs $250-$600 for a typical 200-400 sq ft deck, 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 deck cleaning for composite decking?
For composite decking: low pressure, often under 1,500 PSI with a wide fan tip, held well back; check your decking brand's care guide. What we avoid: high pressure and narrow tips, which can scar the surface and may void the warranty. The cleaning solution does most of the work, followed by a gentle rinse.
Is deck cleaning for composite decking 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 deck cleaning for composite decking?
Every year, more often in shade. 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.