Wood is the most unforgiving surface a pressure washer touches. Too much pressure or the wrong angle and you raise the grain, splinter the boards, or strip the stain. Done right, a soft-wash clean takes years of weathering off a deck or fence in a single afternoon.
Why high pressure is the wrong tool
Wood fibers run in a direction. Hitting them with 3,000 PSI from a wand will lift those fibers, leaving a fuzzy, splintered surface that holds dirt and stains worse than before. You'll also blast off any existing sealer or stain unevenly.
The right approach
- Sweep and clear debris. Leaves and dirt trapped between boards have to go first.
- Apply a wood-safe cleaner. A percarbonate-based brightener or a mild oxalic-acid cleaner kills mildew and lifts dirt without damaging the wood.
- Let it dwell. Give the chemistry 10–15 minutes to do the work.
- Rinse with low pressure (under 1,000 PSI), with the grain. Keep the tip moving and stay 12 inches off the surface.
- Let it dry 48 hours, then seal or stain. Clean wood needs protection or it'll re-grey within a season.
Composite decks
Composite boards can be soft-washed at very low pressure. Many manufacturers warn against high-pressure washing in their warranty fine print — check yours before anyone touches it. The good news: composite responds beautifully to detergent + low pressure.
Fences
Wood fences benefit from the same approach — soft-wash, light rinse, dry, seal. A 100-foot privacy fence usually takes a half-day. Painted vinyl fences need only a soft-wash detergent rinse, no sealing required.
If your deck or fence is grey, green, or splotchy, the wood is fine — it just needs the right cleaning. Request a quote and we'll get it looking new.