How to Wash and Recoat Exterior Wood Decking and Railings

To wash and recoat a deck without peeling: 1) Apply oxygenated bleach deck cleaner (sodium percarbonate) with a garden sprayer, 2) Scrub with a stiff synthetic deck brush, 3) Rinse with a pressure washer at low pressure (800–1,200 PSI with a 40-degree wide fan tip to prevent wood gouging), 4) Neutralize and restore wood pH with oxalic acid brightener, 5) Allow 48 hours dry time until wood moisture is below 15%, and 6) Apply one penetrating coat of oil stain using a stain pad or 4-inch brush.

Outdoor wood deck being cleaned with oxygenated deck cleaner and gentle pressure washer spray

Published 2026-03-01 · Updated 2026-03-01 · 9 min read

The Crucial Wood Brightener Step (Oxalic Acid)

Alkaline deck cleaners raise the wood’s pH and leave the timber dark and blotchy. Applying an oxalic acid brightener neutralizes the wood chemistry, lightens gray fibers back to golden wood tones, and opens wood pores so penetrating oils can soak deep into the cell structure.

Worked Example: 350 Sq Ft Cedar Deck Maintenance Cycle

Cleaning, brightening, and applying a maintenance coat of semi-transparent oil stain.

Spending $220 every 2–3 years protects an expensive $12,000 cedar deck investment indefinitely.

Do I need two coats when restaining an existing deck?

For maintenance recoating with penetrating oil stain, apply only ONE coat. Applying a second coat over partially sealed wood causes the excess oil to pool, remain sticky, and attract dirt.

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