How to Clean a Cedar Deck: A Practical Guide

Introduction

Cedar decks add natural warmth and beauty to outdoor spaces, but they require proper cleaning to maintain their color and longevity. This guide explains a practical, step-by-step approach using common cedar-friendly cleaners and tools. The method aims to remove dirt, mold, and weathered grunge without damaging the wood.

Readers will learn safe preparation steps, effective cleaning sequences, and maintenance tips to keep a cedar deck looking its best season after season.

Quick Answer

Fast method: Pre-wet the deck, apply a cedar deck cleaner concentrate for pressure washer, scrub with a cedar wood scrubbing brush, rinse thoroughly, then brighten with a cedar deck brightener for a refreshed look. For stubborn stains, use a stain remover and cleaner kit and repeat as needed.

What You’ll Need

Cedar deck cleaner concentrate for pressure washer
Cedar deck brightener wood cleaner spray
Deck cleaning brush set cedar wood scrubbing brush
Power washer deck cleaning attachment cedar
Cedar deck stain remover and cleaner kit

	Deck & Wood Cleaner + Brightener Removes Mold, Mildew, Stains, and Tannins, 32 oz. Combo 2 Part System Restores 1200 sq. ft.
	Simpson Cleaning 88282 Cleaner, Concentrated Soap Solution for Pressure Washers and Spray Bottles, Use on Concrete, Vinyl Siding, Appliances, Windows, Cars, Fences, Decks, Purple, 1 Gallon

Before You Start

Assess the deck for loose boards, nails, or warped boards. Clear furniture and plants, and sweep away debris. Protect nearby plants with plastic or water runoff controls. Wear eye protection, gloves, and a dust mask if you’re sensitive to cleaning agents. Estimate time: cleaning plus brightening typically takes 3–6 hours depending on deck size and stain depth. Do not mix cleaners with bleach or ammonia. Ensure good ventilation when using chemical cleaners.

Step-By-Step: How To Clean A Cedar Deck

Prepare the area by removing furniture and laying out drop cloths or plastic to protect plants and surrounding surfaces.
Pre-wet the deck with a garden hose or low-pressure spray to loosen surface grime.
Mix the cedar deck cleaner concentrate for pressure washer according to label directions, ensuring the solution is appropriate for your machine and wood.
Apply the cleaner from one end of the deck to the other using the pressure washer at a low to medium setting, keeping the nozzle at a safe distance to avoid gouging the wood.
Let the cleaner dwell for the recommended time, usually 5–10 minutes, to penetrate dirt and mildew without drying on the surface.
Use the deck cleaning brush set cedar wood scrubbing brush to scrub stubborn areas, paying attention to shaded sections where moss tends to form.
Rinse thoroughly with the pressure washer, starting from the far end and moving toward the exit to prevent dirty water from pooling on clean boards.
Apply the cedar deck brightener wood cleaner spray to restore the wood’s natural color and neutralize any remaining cleaner residue. Follow the product’s coverage guidelines.
Rinse again to remove the brightener and any loosened residue. Allow the deck to dry completely before applying any finish or stain.
Inspect for remaining stains. If needed, repeat the cleaning and brightening steps on problem spots before moving to finish work.
Optional: Apply a cedar deck stain remover and cleaner kit if stains persist, following the kit’s instructions for best results.

Troubleshooting

Symptom	Likely Cause	Fix	Prevention
Wood looks gray after cleaning	Natural aging or insufficient brightening	Repeat brightener application and rinse well	Regular cleaning schedule; don’t skip the brightening step
Stains remain in shaded areas	Mildew or mildew-resistant compounds	Spot-clean with stain remover kit and scrub gently	Pre-wet and treat problem areas early
Bleached or uneven color	Overexposure to cleaner or too strong pressure	Use lower pressure and dwell time; re-wash	Test cleaner on a hidden area first
Excessive wood splintering after cleaning	Rough brushing or aggressive nozzle angle	Switch to a softer brush and flatter spray	Avoid harsh scrubbing on soft cedar

Common Mistakes

Using a high-pressure setting that gouges cedar fibers.
Skipping the rinse after brightening, leaving residues on the wood.
Choosing a cleaner not formulated for cedar or for exterior wood.
Cleaning in direct sun or heat, which can dry cleaners too fast.

Tips For Best Results

Always test cleaners on a small, inconspicuous area first.
Work with the grain of the wood to minimize scratches.
Rinse thoroughly to prevent cleaner residue that may darken wood over time.
Allow a full dry time before applying any stain or sealant for even uptake.

Call A Professional

Seek professional help if the deck shows structural damage, extensive rot, or if the staining process requires precise color matching. Stop and contact a pro if there is persistent black mold growth, soft spots, or warped boards that indicate underlying damage.

FAQ

What is the best cleaner for cedar decks?

The best option combines a cedar deck cleaner concentrate for pressure washer with a cedar deck brightener to restore color and remove grime.

Can I use household bleach to clean cedar?

Avoid household bleach; use cleaners specifically designed for cedar and outdoor wood to prevent damage.

How often should I clean my cedar deck?

Clean at least once a year, or more often if you notice mildew, heavy grime, or algae growth.

Do I need to seal cedar after cleaning?

Yes, applying a finish after drying helps protect cedar from moisture and UV exposure; wait until the wood is fully dry.

Is pressure washing safe for cedar?

Yes, when used with proper settings, attachments, and distance from the wood surface.

What should I do about stubborn stains?

Use a cedar deck stain remover and cleaner kit on problem spots and follow with a thorough rinse and brighten.

How long does cedar deck cleaning take?

Most projects take 3–6 hours depending on size and condition, plus dry time before finishing.

Buying Guide

When choosing products to clean a cedar deck, consider several factors to ensure an effective and safe process. Size and layout influence the amount of cleaner and water you’ll need, so plan for refillable containers and coverage area.

Key factors include noise level, energy efficiency, and ease of use when selecting cleaning attachments or power washers. For outdoor wood, a dedicated cedar deck cleaner concentrate and a brightener designed for wood restore colors rather than harsh chemicals. Look for biodegradable formulations with clear usage instructions and safety guidelines.

Controls should be simple: adjustable spray patterns and pressure settings help tailor the job to cedar’s softness. Placement matters too — avoid cleaning directly under plants or delicate landscaping. If you live in a humid climate, prioritize products that resist mildew regrowth or include brighteners to restore the wood’s natural hue.

Finally, compare bundle options like a cedar deck stain remover and cleaner kit versus individual products. Kits can streamline the process, but ensure each component matches your deck’s needs and your washing system. A well-chosen set reduces time, lowers risk of damage, and leaves a uniformly clean, ready-to-finish cedar deck.