I pressure washed my deck for the first time and it looked beautiful for about six weeks. Then the gray came back. Worse than before. The wood looked dry and tired and a splinter the size of a toothpick went into my bare foot.

I had done half the job. Cleaning is step one. Sealing is the step that actually protects the wood. Skipping it is like washing your car and never waxing it — the clean surface just gets dirty faster because there is nothing protecting it.

Here is the full weekend routine that actually works.

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Day 1: Clean

Clear the deck completely. Furniture, planters, grill — everything off. Sweep thoroughly. If you pressure wash with furniture on the deck, you will blast dirt onto the furniture and then have to clean the furniture too.

Apply a deck cleaner — not just any cleaner, a product specifically labeled for wood decks. It removes gray oxidation, mildew, and the previous sealer residue. Follow the directions on the bottle for dilution and dwell time. Most need 10-15 minutes to work before you scrub or rinse.

Pressure wash or scrub. A pressure washer saves hours. Use a fan tip (not the pinpoint nozzle — that will etch the wood) and keep the nozzle at least 12 inches from the surface. Move in even passes with the grain. If you do not have a pressure washer, a stiff deck brush and a hose work, but your arms will feel it the next day.

Let the deck dry completely — at least 24 hours of dry weather. Sealer applied to damp wood peels within weeks.

Day 2: Seal

Choose a clear waterproofer or a tinted stain-and-sealer combo. Clear lets the natural wood show through but needs reapplication sooner (every 1-2 years). Tinted options have UV blockers that protect the wood from sun damage and last 2-3 years.

Apply with a roller on a pole. It is faster than a brush and covers more evenly than a sprayer for DIYers. Roll in the direction of the wood grain. Do two thin coats rather than one thick one — thick sealer pools in low spots and forms a skin that peels.

Do not seal in direct hot sun. The sealer dries too fast on hot boards and does not penetrate. Work in the morning or on an overcast day so it has time to soak in before the surface skins over.

I did this right the second time — cleaned Saturday, sealed Sunday morning. Two years later the deck still looks good. And no splinters.