Half the deck damage we see in Greater Cleveland was not caused by weather. It was caused by cleaning: the wrong method on the wrong material. Wood and composite decks age differently and need genuinely different care, so here is the field guide.
Wood Decks: Gentle Wash, Then Protect
Pressure-treated pine, cedar, and hardwood decks are porous and soft enough that careless high pressure carves furring and lap marks into the grain permanently. Proper wood deck cleaning uses controlled low pressure with cleaning solutions that lift the gray oxidized layer, kill algae and mildew in the grain, and rinse clean without tearing the fibers.
The bigger point about wood: cleaning is step one, protection is step two. A freshly cleaned wood deck is also a freshly opened one; its pores are clean and ready to accept stain or sealer. That is exactly when a water-repellent finish goes on best and lasts longest. Cleaning a wood deck and leaving it bare in our climate invites the next two winters to undo the work.
Composite Decks: Different Material, Different Enemies
Trex-style composite boards will not rot, but they are not maintenance-free, and the biggest myth is that they never need cleaning. Composites grow surface mold and mildew in Northeast Ohio’s humidity, especially in shade, and they hold pollen, grill grease, and tannin stains from overhanging trees. They also scratch, so aggressive pressure and stiff scraping are out. The right approach is a low-pressure wash with solutions matched to the material, which brings the color back without voiding the manufacturer’s warranty terms on high-pressure washing.
The Mistakes That Ruin Both
- Maximum pressure up close. Etches wood permanently and scars composite.
- Skipping the algae treatment. Blasting green off the surface without killing it guarantees a green deck again next season, and a slippery one in the meantime.
- Sealing over a dirty deck. Stain or sealer applied over mildew locks it in, where it keeps growing under the finish.
- Waiting for “really dirty.” A deck cleaned every year or two cleans up gently; a deck left five years needs restoration.
When to Do It
Any dry stretch from late spring through early fall works, and if staining or sealing is part of the plan, aim for a window with a few dry days after cleaning so wood can dry fully first.
All-Star Power Cleaning handles deck cleaning for wood and composite across Greater Cleveland, rated 5 stars by more than 300 Google reviewers. Call or text (440) 771-1889 or get a free quote and tell us what your deck is made of; the answer changes what we bring.
