Auckland’s wet autumn months are beautiful — but they’re also the perfect storm for moss, mould, and slippery deck surfaces.
If you’ve stepped out onto your deck recently and felt a slimy patch underfoot or noticed a green haze spreading across the timber, you’re seeing early signs of biofilm buildup — the number one cause of deck deterioration and slip hazards.
At Metro Water Blasting, we provide specialist deck cleaning services Auckland-wide, designed to remove algae, mould, and grime — and keep your timber looking fresh and safe, year-round.
✅ Book your Auckland deck cleaning now
Why Decks Become Dangerous in Autumn
| Autumn Conditions | Deck Risk |
|---|---|
| Heavy rain | Leaves decks damp for days |
| Humid air | Encourages moss, mould, algae growth |
| Cooler temps | Slows timber drying, increases slipperiness |
| Fallen leaves | Trap moisture and rot timber underneath |
Whether you live in Grey Lynn, Remuera, Mount Eden, Howick, or Titirangi, your timber deck is likely absorbing moisture and growing slicker by the day.
What Slippery Decks Mean for Your Home and Family
It’s not just about appearances.
- Slippery decks cause falls, bruises, and even hospital visits
- Moss and mould eat into your timber’s surface, accelerating rot
- Algae traps moisture that leads to board warping and cracking
- A dirty deck reduces your outdoor enjoyment and resale value
✅ Regular cleaning doesn’t just make your deck look better — it keeps people safe and saves your timber from early failure.
Why DIY Cleaning Can Damage Your Deck
A common mistake homeowners make is grabbing a pressure washer and blasting the surface.
But high-pressure cleaning can:
- Erode soft timber fibres
- Splinter cedar or pine decks
- Force water under nails and joins, causing internal swelling
- Strip protective oils or stains prematurely
✅ At Metro Water Blasting, we use a gentle soft wash system:
- Biodegradable cleaners break down grime and algae
- Low-pressure rinse protects timber grain
- Slip-risk areas are pre-treated
- Decks are ready for oiling or re-coating if needed
What’s Included in Our Deck Cleaning Service?
✅ Full inspection of the deck condition
✅ Application of anti-fungal and moss-killing detergent
✅ Soft pressure rinse for timber protection
✅ Spot treatment for heavily stained or mossy areas
✅ Optional sealing or anti-slip prep on request
We clean:
- Kwila (Merbau), pine, cedar, macrocarpa
- Painted decks
- Composite or PVC decking
- Poolside timber platforms
- Multi-level entertainment decks and stairs
✅ See why Aucklanders trust Metro with their decks
Ideal Cleaning Frequency for Auckland Decks
| Exposure | Suggested Cleaning |
|---|---|
| Full sun, no trees | Every 12 months |
| Shaded by trees or buildings | Every 6–9 months |
| Poolside or south-facing | Every 6 months minimum |
✅ Autumn is the ideal time to clean — before winter locks in moisture and makes things worse.
Deck Cleaning Across All Auckland Suburbs
We service homes throughout:
- Central Auckland (Ponsonby, Parnell, Epsom)
- North Shore (Takapuna, Birkenhead, Albany)
- West Auckland (Titirangi, Te Atatū, Henderson)
- East Auckland (Botany, Howick, Pakuranga)
- South Auckland (Manurewa, Papakura, Māngere)
No matter the suburb, if your deck is slippery — we’ll clean it safely, thoroughly, and fast.
FAQs About Deck Cleaning
Will cleaning make my deck safe again?
✅ Yes — removing biofilm dramatically reduces slipperiness.
Can I walk on it immediately after?
The surface dries within a few hours. We’ll advise you depending on weather conditions and wood type.
Do you do anti-slip treatments?
Yes — we can prep the surface for sealing, oiling, or anti-slip coating after cleaning.
Do you clean composite (plastic) decking?
✅ Absolutely. We adjust our method for all deck materials.
Get Your Deck Ready for Winter — Book a Clean Today
Don’t let moss, mould, and water damage ruin your outdoor space or cause injuries.
Metro Water Blasting’s deck cleaning Auckland services keep your home safer, cleaner, and more valuable — one soft wash at a time.
📞 Call 0800 997 997 or
🌐 Book your Auckland deck cleaning today