By Deck Building Services · Last reviewed
How do you clean composite decking routinely?
Sweep, then wash with mild soap and warm water using a soft brush along the grain, and rinse well. Do this a couple of times a year, more under trees.
- 1Move furniture and planters.
- 2Sweep and clear debris from the gaps between boards.
- 3Wash with mild soap and warm water and a soft-bristle brush, following the embossed grain.
- 4Rinse thoroughly so no soap film remains.
- 5Let the deck dry before putting furniture back.
How do you remove common stains from composite?
| Stain | Approach |
|---|---|
| Mold or mildew | Manufacturer-approved deck cleaner; rinse; improve airflow and sunlight |
| Grease or oil | Clean promptly with warm soapy water or an approved degreaser |
| Leaf tannins | Wash promptly; many fade with sun and rinsing |
| Rust from furniture | Approved rust remover; add pads under metal feet |
| Pollen film | Rinse and brush; common in spring |
Can you pressure wash composite decking?
Some manufacturers allow it within specific pressure and distance limits using a fan tip; others advise against it. Check your brand's care guide — the wrong pressure or nozzle can damage the surface and void coverage.
What should you not use on composite decking?
- Metal shovels or scrapers.
- Harsh chemicals or cleaners not approved by the manufacturer.
- Wire brushes.
- Wood stains or sealers (capped composite isn't designed to be stained).
- Rock salt or ice-melt not listed as compatible with your boards.
How do you keep composite decking clean longer?
- Keep gaps clear so water drains.
- Trim branches overhanging the deck.
- Use grill mats and furniture pads.
- Rinse after pollen season and after leaf fall.
- Choose multi-tone colors that hide dust.
How do you stop mold coming back on composite?
Remove what it feeds on and let the deck dry: keep gaps clear, trim back overhanging plants, rinse off pollen and leaves, and improve airflow underneath.
Mold on capped composite usually grows on the layer of organic debris sitting on the surface, not in the board itself. Shaded decks near trees and lawns need more frequent washing. Moving planters and rugs occasionally lets the surface underneath dry out.
How do you protect composite from grill grease and heat?
- Place a grill mat under the grill.
- Keep the grill clear of siding and railings per its clearance instructions.
- Wipe grease spots while fresh.
- Never set hot coals, ash or a fire bowl directly on the boards.
What is a good composite deck cleaning schedule?
| Season | Task |
|---|---|
| Spring | Wash off winter grime and pollen; check gaps and drainage |
| Summer | Spot-clean spills promptly; move planters to avoid marks |
| Fall | Remove leaves quickly to prevent tannin stains |
| Winter | Plastic shovel only; approved ice-melt; keep stairs clear |
Is cleaning different for older uncapped composite?
Yes. First-generation uncapped boards absorb more moisture and stain more easily, so mold and fading are more common and harsher cleaning can damage them.
Some manufacturers sell cleaners and restorers for older boards. If uncapped boards are badly stained, swollen or flaking, replacement with capped boards may be the better long-term fix.
How do you remove snow and ice from composite decking?
- Use a plastic shovel and push along the boards, not across them.
- Use only ice-melt products the manufacturer lists as compatible.
- Rinse residue off in spring.
- Clear stairs first for safety.
Is PVC decking cleaned the same way?
Mostly. PVC also cleans with mild soap and water and a soft brush. Rinse pool chemicals regularly and follow the PVC manufacturer's guide for stain removers and pressure washing.