How to Clean Outdoor Furniture (Plastic, Metal, Timber and Wicker)

Outdoor furniture takes a beating from Adelaide's climate — intense UV exposure, dust, occasional storms, and the general wear of outdoor use. Different materials respond very differently to weathering and require genuinely different cleaning approaches. Using a one-size-fits-all method (a common mistake) can fade, crack, corrode or otherwise damage furniture that would otherwise have lasted for years.

This guide covers the correct method by material.

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Plastic and Resin Furniture

The most common and generally most forgiving outdoor furniture material — but still susceptible to UV degradation (chalking) and staining over time.

Regular Cleaning

1. Hose off loose dust and debris.
2. Wash with warm water and a few drops of dish soap, using a soft brush or cloth.
3. For stubborn dirt in textured or moulded areas, an old toothbrush gets into grooves and crevices.
4. Rinse thoroughly and allow to air dry.

Addressing Chalking (Faded, Powdery White Surface)

UV exposure breaks down the polymer surface of plastic furniture over time, producing a chalky, faded appearance — most pronounced on darker coloured furniture, which absorbs more UV.

Method:

1. Apply a plastic restorer product (automotive trim restorer products like Meguiar's or 303 Protectant work well, as do dedicated outdoor furniture restorers) to a cloth.
2. Rub into the surface, following the product's specific instructions.
3. These products typically both clean the chalky residue and deposit a UV-protective coating that slows further degradation.

For furniture that's chalked significantly and where restoration products don't fully address it, repainting with a dedicated outdoor plastic furniture spray paint (specifically formulated to adhere to plastic, with UV-resistant pigment) is a practical option that extends the furniture's usable life significantly.

Stain Removal

For green algae or mould staining (common in shaded outdoor areas): A diluted bleach solution (1:10 with water) applied, left for 10 minutes, scrubbed and rinsed addresses most biological staining on plastic furniture.

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Metal Furniture

Powder-Coated Aluminium

The most common modern outdoor metal furniture finish — durable and relatively low maintenance.

1. Wash with warm soapy water and a soft cloth or sponge.
2. Rinse thoroughly.
3. Check for any chips in the powder coating — these expose bare aluminium to moisture and can begin corroding (forming white, powdery aluminium oxide) if not addressed.
4. For chips, lightly sand the area, clean, and apply a matching touch-up paint (many manufacturers supply touch-up paint matched to their powder coat colours).

Wrought Iron and Painted Steel

More prone to rust than aluminium given the underlying ferrous metal.

1. Wash with warm soapy water.
2. Inspect closely for any rust spots — these need addressing promptly as rust spreads under paint if left.
3. For rust spots: sand back to bare metal with fine sandpaper, treat with a rust converter (available at hardware stores — converts existing rust to a stable, paintable surface), then prime and repaint with an outdoor-rated metal paint.
4. For furniture with significant rust throughout, professional re-coating (sandblasting and powder coating) may be more cost-effective than piecemeal touch-ups, depending on the furniture's value and condition.

Galvanised or Stainless Steel

Generally the most corrosion-resistant metal furniture option.

1. Wash with warm soapy water.
2. For stainless steel specifically, wipe with the grain (as per our stainless steel cleaning guide) and finish with a light coat of stainless steel polish or mineral oil for ongoing protection.
3. For mild surface rust on galvanised steel (less common but can occur with coating damage), a fine wire brush followed by a cold galvanising spray (zinc-rich paint) restores the protective coating.

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Timber Furniture

Teak (the Premium Standard for Outdoor Timber)

Teak naturally weathers to a silvery-grey colour over time due to UV exposure breaking down surface oils — this is a natural process, not damage, and many people prefer the weathered look. However, for those wanting to maintain or restore the original honey-brown colour, regular treatment is needed.

Cleaning:

1. Wash with warm water and a teak-specific cleaner, or a mild soap solution.
2. Scrub gently with a soft-bristle brush, working with the wood grain.
3. Rinse thoroughly.

Restoring colour (optional):

1. Apply a teak brightener (oxalic acid based) following product instructions — this removes the grey weathered layer and restores the lighter colour.
2. Rinse thoroughly.
3. Once dry, apply teak oil to nourish the wood and slow the re-greying process (though greying will recur over months without ongoing maintenance — this is the nature of teak's weathering).

Other Hardwoods (Eucalyptus, Jarrah, Merbau)

Similar approach to teak — wash with mild soap solution, scrub gently with the grain, rinse. These timbers also benefit from periodic oiling (using a product specifically formulated for the timber type) to maintain colour and protect against checking (surface cracking) from UV and moisture cycling.

Softwood (Pine) Outdoor Furniture

More susceptible to weathering damage than hardwoods and typically painted, stained or treated with a protective coating.

1. Wash with mild soap solution.
2. Inspect the protective coating (paint, stain, sealant) for wear — softwood deteriorates faster than hardwood once the protective coating fails, so addressing coating wear promptly extends furniture life significantly.
3. Sand and recoat as needed, following the specific product's recoating guidance (typically annually for high-UV-exposure furniture in Adelaide's climate).

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Wicker and Rattan (Natural and Synthetic)

Natural Wicker/Rattan

Natural fibre furniture is the most weather-sensitive outdoor furniture type and is genuinely best suited to covered or indoor-outdoor use rather than full sun and rain exposure.

1. Dust regularly with a soft brush attachment on the vacuum, getting into the woven texture.
2. For cleaning, use a barely damp cloth with mild soap — avoid saturating natural wicker, as excess moisture causes the natural fibres to swell, weaken and eventually crack or unravel.
3. Dry thoroughly and quickly after any wet cleaning — natural fibre furniture should not be left damp.
4. Store undercover during wet weather where practical, as natural wicker degrades significantly faster with direct rain exposure than synthetic alternatives.

Synthetic Wicker (PE Resin Wicker)

Designed specifically for outdoor durability and significantly more weather-resistant than natural wicker.

1. Hose off loose dust and debris.
2. Wash with warm soapy water and a soft brush, working into the woven texture.
3. Rinse thoroughly — synthetic wicker can tolerate more thorough rinsing than natural fibre.
4. For mould or mildew in the weave (can develop in humid, shaded conditions even with synthetic material), a diluted bleach solution applied with a soft brush, left for 10 minutes, then rinsed thoroughly.

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Cushions and Fabric

Covered in detail in our outdoor entertaining area guide — the key points: most quality outdoor cushion covers are machine washable (check care labels), foam inserts that have developed mould should be replaced rather than cleaned, and proper storage (ventilated, undercover) between uses extends fabric life significantly compared to leaving cushions exposed year-round.

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General Maintenance Habits

Cover furniture when not in use for extended periods — particularly through Adelaide's winter when outdoor furniture sees less use. Quality outdoor furniture covers significantly extend the life of all material types by reducing UV and weather exposure during low-use periods.

Address issues promptly — a small rust spot, a small mould patch, or a small coating chip is far easier and cheaper to address than the same issue left to develop and spread over a season.

Seasonal deep clean — align with the pre-summer outdoor area preparation timing for a thorough annual reset of all outdoor furniture.

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For professional outdoor furniture cleaning as part of a broader outdoor area service in Adelaide, contact PF Cleaning Adelaide.

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Written by Victor Jacon — Master Cleaner & Home Detailing Specialist, Founder of PF Cleaning Adelaide.