Cleaning composite decking regularly is key to keeping it looking fresh and extending its lifespan. With just a few simple steps and commonly available cleaning solutions, you can easily remove dirt, mold, mildew and other debris from your composite deck.
Step 1: Sweep and Rinse
The first step is to thoroughly sweep your deck to remove any loose debris like leaves, dirt and sand. Use a stiff-bristled broom to dislodge stuck-on debris.
After sweeping, rinse the deck using a garden hose.Aim a fan nozzle at the surface to wash away dirt and debris. Rinsing also helps dampen the deck in preparation for cleaning.
Step 2: Make a Cleaning Solution
For routine cleaning, make a DIY composite deck cleaner by mixing:
- 1/3 cup mild dish soap
- 1/3 cup laundry detergent
- 1 gallon of warm water
This gentle soap solution helps lift dirt and grime without harsh chemicals. For tougher stains or mold removal, substitute 1 cup oxygen bleach cleaner instead.
Tip: Always test your cleaning solution on a small, inconspicuous area first before cleaning the entire deck to check for colorfastness.
Step 3: Apply the Cleaning Solution
Use a mop, soft brush or pressure washer at low pressure to apply your cleaning solution liberally over the deck. Let it soak for 5-10 minutes. This gives the solution time to break down dirt and stains.
For textured surfaces, use a stiff nylon brush to thoroughly scrub the cleaning solution into the grooves. Avoid metallic brushes which could scratch the deck.
Step 4: Rinse Thoroughly
After letting it soak, use a garden hose or pressure washer to rinse away the cleaning solution. Aim the stream along the direction of the deck boards to wash away debris.
Rinse until all traces of soap are gone. Any residue left behind can cause buildup over time.
Step 5: Allow to Dry
Once cleaned, use a leaf blower or fan nozzle to blow away pools of water. Allow the deck to air dry completely before using.
Avoid walking on the deck while wet, as debris could get trapped in gaps. Drying also prevents moisture from seeping into cracks and joints.
Tips for Maintaining a Composite Deck
- Inspect the deck periodically, cleaning it whenever it looks dirty or stained. Don’t allow debris and mold to accumulate.
- For prevention, apply a composite deck sealer annually. Sealers protect against moisture, mildew, and UV damage.
- Sweep leaves, dirt and other debris regularly using a broom or leaf blower. Don’t let it pile up.
- Follow the manufacturer’s care and cleaning guidelines to avoid damage.
- Avoid using a pressure washer around fasteners or end gaps. High pressure water can loosen joints.
- Alternate between a mild detergent and oxygen bleach cleaner for the best results.
- Clean under furniture and accessories that sit directly on the deck.
- Wipe spills as soon as they occur to prevent stubborn staining.
Frequently Asked Questions
How often should you clean composite decking?
It’s best to clean composite decks at least twice per year, in the spring and fall. Clean more frequently if the deck gets heavy use, spills or stains.
What should you not use to clean composite decking?
Avoid harsh cleaners with acids, bleach or chlorine as these can discolor or damage the deck. Solvents like acetone can also degrade the decking material.
How do you remove mold from composite decking?
Mix 1 cup oxygen bleach cleaner with 1 gallon of warm water. Scrub into affected areas with a stiff nylon brush. Allow to sit 10 minutes before rinsing. Repeat as needed.
Can you pressure wash composite decking?
Yes, you can use a pressure washer on low pressure under 1500 psi. Use a fan nozzle and keep it 6 inches above the deck to avoid damage. Never pressure wash fastener holes.
What is the fastest way to clean a composite deck?
Using a pressure washer on the lowest setting will clean composite deck boards the quickest. Take precautions not to damage the material.
Conclusion
Regular cleaning and maintenance is essential for any composite decking to keep it looking pristine and expand its lifespan. By following these easy 5 steps of sweeping, rinsing, scrubbing with a cleaning solution, rinsing thoroughly and drying, you can remove dirt, debris, mold and other blemishes from the deck surface. Consistently cleaning your low-maintenance composite deck every few months will preserve its quality and appearance for many years.