Pressure Wash Deck
Pressure wash a deck gently to remove dirt and mildew without gouging the wood or forcing water into joints. Use the lowest effective pressure, a wide fan tip, and steady passes along the grain.
Tools
- Pressure washer
- Wide fan spray nozzle
- Garden hose
- Broom
Materials
- Deck cleaner suitable for your deck material
- Water
Safety
- Wear eye protection, gloves, long pants, and slip-resistant footwear.
- Start with the lowest pressure setting and a wide fan nozzle.
- Test the spray on a small hidden area before cleaning the whole deck.
- Keep the wand moving and do not hold the spray in one spot.
- Maintain a safe distance from the deck surface to avoid gouging wood.
- Do not spray upward into board seams, gaps, rail joints, or siding.
- Keep people, pets, and electrical cords away from the work area.
- Wet decking is slippery; move carefully and let the deck dry fully before normal use.
Steps
Step 1: Clear and inspect the deck
- Remove furniture, planters, rugs, and other items from the deck.
- Sweep off leaves, dirt, and loose debris.
- Inspect for loose boards, popped fasteners, splinters, rot, or damaged railings.
- Cover or avoid nearby electrical outlets, lights, and anything that should not get wet.
Check: The deck surface is clear of obstacles and loose debris. · You have identified any damaged areas that should not be pressure washed aggressively.
Step 2: Set up the washer safely
- Connect the pressure washer according to the manufacturer instructions.
- Install a wide fan nozzle and choose the lowest practical pressure setting.
- Run water through the system before starting if required by your machine.
- Plan to work from the house outward or in a consistent direction along the boards.
Check: The machine is connected properly and operating normally. · A wide fan tip is installed and the pressure is set low.
Step 3: Test a small hidden area
- Choose an inconspicuous spot on the deck.
- Hold the wand at a moderate distance from the surface and spray with the grain.
- Keep the nozzle moving in smooth passes.
- Adjust distance before increasing pressure; use only as much force as needed to clean.
Check: The test area looks cleaner without fuzzy wood fibers, gouges, or visible damage. · You know the distance and speed that clean effectively and safely.
Step 4: Apply cleaner if needed
- If the deck has mildew, grime, or heavy staining, apply a deck cleaner labeled for your deck material.
- Follow the product directions for dilution, dwell time, and rinsing.
- Do not let cleaner dry on the surface.
Check: Cleaner has been applied only if needed. · You are following the cleaner label instructions exactly.
Step 5: Wash the deck boards
- Pressure wash one or two boards at a time using long, overlapping passes.
- Keep the wand moving steadily along the grain.
- Maintain a consistent distance from the surface.
- Avoid spraying directly into gaps, joints, rail posts, or under siding.
- Work methodically across the deck to avoid missed spots and overlap marks.
Check: The deck is becoming evenly clean without streaks or lap marks. · The wood surface is not splintering, furrowing, or becoming fuzzy.
Step 6: Rinse and review
- Rinse away any remaining cleaner or loosened dirt.
- Check corners, edges, stairs, and around railings for missed areas.
- Touch up lightly rather than repeatedly blasting one spot.
Check: No cleaner residue or heavy dirt remains on the deck. · The surface looks uniformly cleaned.
Step 7: Dry the deck completely
- Allow the deck to dry fully before replacing furniture or walking on it normally.
- If you plan to stain or seal the deck, wait until the wood is fully dry per product guidance.
Check: The deck is dry to the touch and no longer slippery. · The surface is ready for normal use or for the next finishing step.
