How often should I clean my deck in Bothell?

Annually is ideal in Bothell's climate. Black algae and moss build up quickly on shaded or north-facing decks. Cleaning annually protects the wood and extends the life of any stain or sealer applied.

Deck & Patio Washing Bothell WA | Wood & Composite Deck Cleaning

Deck Cleaning in Bothell's Pacific Northwest Climate

Bothell decks take a beating. Year-round rain, heavy tree canopy, and minimal winter sunlight on north-facing or covered decks create ideal conditions for black algae, green moss, and mildew. What starts as surface discoloration becomes embedded growth that damages wood fibers and makes composite surfaces slippery and unsafe.

We clean wood, composite, and concrete deck surfaces using the right technique for each material. Wood decks get a controlled low-pressure wash that cleans deep without raising the grain. Composite gets a gentle approach that respects manufacturer specs. Concrete patios get the high-pressure treatment that removes years of biological buildup.

Wood Deck Cleaning

Pressure washing is the most effective way to restore a wood deck — but it has to be done at the right pressure. Too high and you'll raise the grain, splinter the surface, and shorten the life of the wood. We use controlled low-pressure with appropriate cleaning agents to lift mold, algae, and old stain without damaging the boards.

Removes black algae, mold, mildew, and green moss
Lifts old stain and sealer residue for restaining prep
Opens wood grain for better stain penetration
Safe for cedar, redwood, pressure-treated lumber, and pine

Composite Deck Washing

Composite and Trex-style decking is low maintenance but not no-maintenance. Algae and mold still grow on composite surfaces in Bothell's climate, and many homeowners are surprised how dirty their "maintenance-free" deck gets. We clean composite at manufacturer-recommended pressure — typically under 1,500 PSI — and leave the surface looking new without voiding your warranty.

Concrete Patio Cleaning

Concrete patios in Bothell turn green fast in shaded areas. We blast off algae, moss, and staining with commercial-grade pressure washing and leave a clean, bright surface. Many customers schedule patio cleaning ahead of summer entertaining or before adding outdoor furniture for the season.

Staining & Sealing Prep

If you're planning to stain or seal your deck, pressure washing is the required first step. Stain applied over old buildup, mold, or previous sealers won't adhere properly and will peel within a season. We clean your deck to a surface that's ready for the stain contractor or a DIY application. Ask about our deck prep service when you call.

Patio Furniture & Surfaces

We also clean outdoor furniture, pergolas, fences adjacent to patios, and concrete steps as add-ons to a deck washing job. Many customers combine deck washing with a driveway cleaning for a single-visit price.

Deck Washing FAQ

Yes, but composite decking requires lower pressure than wood or concrete — typically 1,200–1,500 PSI. We follow manufacturer guidelines to clean without voiding warranties or damaging the surface texture.

Yes. Pressure washing is the essential first step before stain or sealer application. We remove old surface buildup, open the wood grain, and leave the surface ready for your contractor or a DIY stain job. The deck should dry 24–48 hours before staining.

Annually is ideal in Bothell's climate. Black algae and moss build up quickly on shaded or covered decks. Regular cleaning also extends the life of any stain or sealer, saving you money long-term.

Yes — concrete patios are one of our most common jobs. We remove green algae, staining, and grime with appropriate pressure and leave the surface looking dramatically better. Many customers combine deck + patio cleaning for a single-visit price.

Deck & Patio Washing in Bothell, WA