Professional Decking Cleaning in Cornwall – Safe, Deep & Long-Lasting Results
★★★★★ Eco / Safety / Guarantees
Expert decking cleaning in Cornwall. Safe soft washing for wooden and composite decking. Remove algae, black mould, mildew & slippery surfaces. Restore colour. Free quotes.
Ready to restore your outdoor spaces?
Get a free quote today from Cornwall’s pressure washing experts.
Decking looks beautiful when it’s clean—but Cornwall’s damp, coastal climate means timber and composite decks quickly become covered in slippery algae, moss, mould and black staining.
At Cornwall Exterior Cleaning, we specialise in safe, non-damaging decking cleaning that restores colour, removes algae and brings your outdoor space back to life. Whether it’s a family deck, holiday let terrace or balcony area, we transform your decking safely and effectively.
Why your Decking needs cleaning
Decking is one of the most slippery surfaces when algae builds up—especially in Cornwall’s wet climate.
✔ Improve Safety
Slippery decking is a major fall risk. Soft washing removes the growth that causes slips.
✔ Restore Natural Colour
Timber naturally darkens and stains—professional cleaning brings it back to life.
✔ Protect the Wood
Algae and mould trap moisture, which leads to:
Rot
Warping
Timber decay
Reduced lifespan
✔ Prepare for Oiling or Staining
Perfect before applying decking oil, stain or protective treatment.
✔ Better for Holiday Lets
A clean deck improves guest experience and boosts reviews.
Our Decking cleaning process
1. Inspection & Preparation
We assess the decking type (wood or composite), condition and level of algae.
2. Pre-Treatment
A specialist solution is applied to break down:
Algae
Black mould
Mildew
Lichen
Organic growth
3. Low-Pressure Soft Washing
We clean decks using low pressure only to prevent:
Splintering
Etching
Surface damage
Raised wood grain
This ensures a safe, even clean.
4. Rinse & Detail Cleaning
We remove all residue, dirt and debris for a spotless finish.
5. Optional: Decking Treatment
We can apply:
Decking oil
Wood preserver
Anti-slip coatings
Composite brighteners
These help protect and extend the life of your decking.
Why choose Cornwall Exterior Cleaning
✔ Deck cleaning specialists
Safe for timber and composite surfaces.
✔ No high pressure
We use methods designed to protect your decking.
✔ Local Cornish business
We understand coastal algae growth more than anyone.
✔ Long-lasting results
Biocide treatments prevent regrowth for months.
✔ Fully insured & trained
Professional service, every time.
✔ Perfect for homeowners, landlords & holiday lets
Keep your outdoor spaces safe, clean and welcoming.