Proper Way to Wash Composite Decks Without Causing Damage
Composite decking is a low-maintenance alternative to wood, but it still needs periodic cleaning to keep it looking its best. Follow these steps to safely remove dirt, mold, and stains—without harming the deck’s surface or voiding any warranties.
1. Gather Your Materials
Broom or leaf blower – to remove loose debris
Mild deck cleaner – specifically formulated for composite materials
Soft-bristle brush or deck scrub brush – avoid wire brushes or stiff bristles
Garden hose with spray nozzle – capable of a moderate, even stream
Bucket and mixing stick – for dilution
Protective gloves and safety glasses
2. Remove Surface Debris
Sweep or blow off leaves, sticks, and dust.
Inspect for any nails or screws that have popped up, and reset them flush with the deck surface.
3. Pre-Rinse the Deck
Use the garden hose on a low to medium pressure setting to wet the entire deck.
This removes loose dirt and helps the cleaner spread evenly.
4. Apply Cleaner Carefully
Dilute the deck cleaner according to the manufacturer’s instructions—too strong a mix can leave residue or bleach spots.
Work in sections (no more than 100 square feet at a time).
Apply the solution with a pump sprayer or soft-bristle brush.
5. Scrub Gently
Using a soft-bristle brush, scrub along the grain of the decking boards.
Apply moderate pressure, enough to lift stains but not so much that you scratch the composite.
For stubborn mold or algae, let the cleaner sit for 5–10 minutes before scrubbing lightly.
6. Rinse Thoroughly
Switch to a medium-pressure spray on your hose.
Rinse each section until no suds remain—leftover cleaner can dull the deck’s finish.
Keep the nozzle moving to avoid concentrating water in one spot (which can force debris between boards).
7. Tackle Tough Stains Separately
For oil or grease spots, use a composite-safe degreaser and a soft nylon pad.
Rinse immediately after treatment to prevent residue.
8. Final Inspection & Drying
Walk the deck to spot any missed areas or pooling water.
Allow the deck to air-dry completely (usually 24–48 hours) before replacing furniture or mats.
Pitfalls to Avoid
High-pressure washers: Never exceed 1,500 psi or use a zero-degree nozzle—too much force can gouge the surface.
Harsh cleaners: Avoid bleach or household detergents; they can strip color and damage the composite.
Wire brushes or metal scrapers: These will scratch and weaken the deck boards.
Cleaning in direct sunlight: Work in the morning or late afternoon to prevent cleaners from drying too quickly and leaving streaks.
Why Professional Composite Deck Washing Matters
At TLC: Making It Easy, our technicians:
Use industry-approved cleaners and the proper dilution rates.
Employ low-pressure equipment to protect your deck’s integrity.
Perform a thorough inspection before and after cleaning.
Keeping your composite deck clean not only preserves its beauty but also extends its lifespan. Ready to refresh your outdoor living space? Contact us today for expert composite deck washing that delivers a spotless finish—without the worry of damage.