Wood Deck Cleaning West Palm Beach

South Florida heat, humidity, and afternoon rain are hard on wood decks, and the dark mildew and slippery green film they grow can look like permanent damage when it is only surface growth. Wood deck cleaning covers decks, stairs, and railings across West Palm Beach and Palm Beach County, using a low pressure approach that protects the wood instead of scarring it.

Why Wood Decks Need a Gentler Method

Wood is far softer than concrete, so the pressure that cleans a driveway can gouge deck boards, raise the grain, and leave an uneven surface. The treatedwood.com guide to cleaning wood decks says to use the lowest possible pressure that effectively cleans the surface, and warns that in the wrong hands, your deck can be damaged.

That is why wood decks sit on the gentle side of the line we explain in our guide to soft wash vs pressure wash.

Distance, Tip, and Grain

The same guide gives specific technique. It recommends starting at least 24 inches from the deck, avoiding anything closer than 16 to 20 inches unless the pressure is very low, and using only a fan tip with a spread of 40 to 60 degrees. Narrow streams and rotating tips are to be avoided, and the work should be tested on a small hidden spot first.

It also says to work parallel with the wood grain. Running the spray lengthwise along the boards with a slight overlap gives an even result and avoids the striping that cross grain passes can leave.

Oxygen Bleach vs Chlorine Bleach

The cleaner matters as much as the pressure. The treatedwood.com guide describes oxygen bleach, which is sodium percarbonate, as an environmentally friendly and excellent detergent and bleaching agent that works well on deep rooted growth in porous wood. It does not recommend chlorine bleach for treated wood, saying overuse can leave an unnatural whitewashed look and raise the wood fibers, and that it can corrode metal fasteners and harm nearby plants.

The Journal of Light Construction makes the same case in its piece on cleaning pressure treated decking: chlorine bleach breaks down lignin in the wood, while hydrogen peroxide, oxygen bleach, and sodium percarbonate do not damage lignin and are more effective against mold and mildew spores. Our approach to wood follows that guidance, with an oxygen based cleaner and low pressure instead of chlorine bleach on treated lumber.

Brightening and Sealing

After an oxygen based cleaner, the treatedwood.com guide recommends an oxalic acid deck brightener to return the wood to its natural pH, followed by a thorough rinse, which also helps the final stain finish. The wood then needs to dry completely before any stain or sealer goes on, and the product label sets the exact drying time, so follow it.

Cleaning and refinishing are separate steps. The Journal of Light Construction calls cleaning an annual affair, and refreshing the finish is a different job. If you plan to restain, tell us when you book so the cleaning lines up with your refinishing schedule.

Florida Conditions: Mildew, Shade, and Rain

Decks under trees, covers, or the shade of the house stay damp longer and grow mildew faster, and afternoon rain keeps that moisture coming. Stairs, lower boards, and the undersides of railings are usually the first places to turn dark or slick.

If your deck sits inside a pool cage, see our screen enclosure and fence cleaning service, since cleaning the screens first, from the top down, keeps runoff from landing on a deck that was just finished.

Deck Types We Clean

• Pressure treated pine, the most common deck lumber, cleaned with an oxygen based cleaner and low pressure
• Cedar and other softwoods, which are softer still and get extra care with pressure and distance
• Hardwood decks, cleaned with the same gentle approach and checked for finish wear
• Composite decking, which can generally take more pressure than wood, though the manufacturer’s care instructions come first

Signs Your Deck Is Due

• Dark or black spots on the boards, especially in shaded areas
• A green or slippery film on stairs and lower boards
• Mildew on railings and posts
• A gray, weathered look that has replaced the original wood color
• Water soaking in instead of beading, which can mean the finish is worn
• Stains under planters, furniture, or grill mats

What Wood Deck Cleaning Covers

• Deck boards, stairs, and railings
• Posts, pergolas, and other outdoor wood structures
• Outdoor wood furniture
• Wood fences, see screen enclosure and fence cleaning
• Paver and concrete areas around the deck, see paver and patio cleaning

How Often Should a Wood Deck Be Cleaned?

A yearly cleaning is a good baseline for most wood decks, and shaded or damp decks may need it sooner. Catching mildew early keeps the cleaning gentler and the boards in better shape, while waiting until growth is heavy can mean more scrubbing and more wear. A free on site estimate will show what your deck needs.

Frequently Asked Questions

Wood decks vary in age, species, and finish, and a quick look at the actual boards is the best way to get the method and the price right. Request a free on site estimate and get a plan built around what you have. For every service in one place, see the complete pressure washing guide, and for real cost ranges see our 2026 pricing guide. We also serve Palm Beach Island, Palm Beach Gardens, North Palm Beach, and Boynton Beach.