A summer of alfresco lunches, sun cream and the odd rain shower takes its toll on garden seating. This guide is for anyone whose outdoor cushions have gone grubby, gained a musty smell or picked up a stubborn stain, and it walks you through cleaning covers and foam safely so your seating looks fresh for years rather than one season.
1. Know your cushion before you clean
Before you reach for a bucket, work out what you are actually dealing with. Outdoor cushions are usually built from two parts: an outer cover and a foam or fibre inner. The cover fabric matters most, because it dictates which cleaning method is safe. The most common outdoor fabrics in the UK are solution-dyed acrylic (the fibre is coloured all the way through, so it resists fading and bleach-based cleaners well), polyester with a water-repellent finish, and cheaper printed cottons that are less weatherproof.
Always check the care label first. Look for the wash symbols, a stated maximum temperature, and whether the cover is removable via a zip. Many garden cushions have zipped covers that can be machine washed, while all-in-one sealed cushions must be spot-cleaned only. If the label is long gone, treat the cushion as delicate: cool water, a gentle cleaner and a test patch in a hidden spot before you commit to the whole thing.
2. Everyday care and quick maintenance
The easiest cushions to clean are the ones you never let get truly dirty. A few minutes of routine care through the season prevents the deep-set grime and mildew that force a full wash. It is the same principle we cover in our wider guide on how to care for your furniture: small, regular attention beats occasional heavy scrubbing.
- Give cushions a brisk shake and a brush-down weekly to remove pollen, dust and crumbs before they bind into the fibres.
- Wipe away bird droppings, tree sap and food spills as soon as you spot them, while they are still wet and easy to lift.
- Bring cushions under cover, into a storage box or indoors when heavy rain is forecast, and never leave damp cushions stacked together.
- Rotate and plump them so one side does not fade or flatten faster than the other.
A quick refresh between deep cleans is simple: mix a little washing-up liquid into warm water, wipe the surface, rinse and let the cushion air-dry fully before use.
3. Your outdoor cushion cleaning kit
You almost certainly own everything you need already. Gathering it before you start saves trips back and forth and stops a half-wet cushion sitting around.
- A soft brush such as a nail brush or a soft-bristled scrubbing brush for loosening dry dirt.
- Mild detergent — washing-up liquid or a gentle laundry liquid. Avoid harsh degreasers on printed fabrics.
- White vinegar and bicarbonate of soda for odours, light mould and general freshening.
- Two buckets, one for cleaning solution and one for rinsing.
- A garden hose or a low-pressure spray. Skip the pressure washer, which can shred stitching and force water deep into foam.
- Clean microfibre cloths and old towels for blotting and speeding up drying.
4. Cleaning removable covers step by step
If your cushions have zipped, removable covers, you have the easiest job. Take the covers off the foam and follow the care label. Here is a reliable routine for hand-washing, which suits almost every outdoor fabric:
- Brush off loose dirt and shake the cover outdoors.
- Fill a bucket or bath with cool to lukewarm water and a small amount of mild detergent.
- Submerge the cover and agitate gently by hand. Work a soft brush over any marked areas rather than scrubbing hard.
- Rinse thoroughly with clean water until no suds remain — leftover detergent attracts dirt and can leave stiff patches.
- Press out excess water without wringing, which can distort the shape, then reshape and hang to dry.
Machine washing is fine only if the label allows it. Use a cool, gentle cycle, a mild liquid detergent and no fabric softener, and turn covers inside out to protect any printed design. Crucially, never tumble dry outdoor covers — the heat can shrink the fabric so it no longer fits the foam, and it can melt any waterproof coating. Air-dry every time.
5. Cleaning the foam inners
Foam is where trouble hides. It absorbs water, holds odours and, if left damp, becomes a breeding ground for mildew from the inside out. Because you cannot machine wash foam, the approach is surface cleaning followed by patient drying.
For a light clean, wipe the foam with a cloth dampened in warm soapy water, then wipe again with clean water. For a deeper clean or to shift a smell, lay the foam flat, sponge a solution of mild detergent over both sides, and rinse by pressing clean water through it and squeezing gently — imagine washing a giant sponge. The single most important step is drying: stand the foam on its edge in a warm, airy spot and turn it regularly. Foam that feels dry on the surface can stay wet in the core for a day or more, so give it far longer than you think it needs before you re-cover it. Re-covering damp foam is the number one cause of that persistent musty garden smell.
6. Tackling common stains
Different stains respond to different treatments, and using the wrong one can set a mark permanently. Blot spills rather than rubbing, work from the outside of the stain inwards, and always test your chosen treatment on a hidden area first. The table below covers the culprits you are most likely to meet on garden seating and dining sets.
| Stain | Treatment | Notes |
|---|---|---|
| Food and drink | Mild detergent in warm water, blotted and rinsed | Act while fresh; dried-on food needs soaking first |
| Grease and sun cream | Washing-up liquid worked in gently, then rinsed | Sprinkle bicarbonate of soda first to absorb oil |
| Bird droppings | Lift solids, then warm soapy water | Never rub while wet — it spreads and stains |
| Red wine and berries | Blot, then dab with diluted white vinegar | Rinse well; avoid hot water, which sets the colour |
| Tree sap | Small amount of surgical spirit on a cloth | Test first; follow with soapy water and a rinse |
| Mud and grass | Let dry, brush off, then wash the residue | Washing wet mud pushes it deeper into fibres |
For any stain, the golden rule is speed. A spill dealt with in the first hour usually lifts completely, while the same stain left for a week may never fully disappear.
7. Removing mould and mildew
Damp plus warmth equals mould, and outdoor cushions offer plenty of both. Black or green speckling and a musty smell are the tell-tale signs. Tackle it on a dry day so everything can dry out afterwards, and work outdoors or in a well-ventilated space because disturbing mould releases spores.
White vinegar is the safest first line of defence. Mix equal parts white vinegar and water, spray or sponge it onto the affected area, leave it for around fifteen minutes, then scrub gently with a soft brush and rinse. For stubborn patches, make a paste of bicarbonate of soda and water, work it in, and rinse thoroughly. On genuinely colourfast, bleach-safe solution-dyed acrylic — and only where the label confirms it — a heavily diluted oxygen-based cleaner can help, but always test first. Once treated, the cushion must dry completely in the sun or a warm airy spot, as any lingering moisture simply invites the mould straight back.
8. Drying and storing for longevity
Thorough drying is not the boring final step — it is the step that determines whether your cushions last. Always air-dry outdoor cushions and covers in a warm, well-ventilated position, ideally in a breeze, and turn them so both sides and all edges dry evenly. Confirm the foam core is bone dry before re-covering.
When the season ends, store cushions somewhere dry — a garage, shed, waterproof storage box or ottoman, or indoors. Make sure they are completely dry before they go away, keep them off cold concrete floors that can draw up damp, and avoid squashing them under heavy items so they keep their shape. A breathable storage bag is better than sealed plastic, which can trap the tiniest bit of residual moisture and cause mould over winter. If you would like a broader view of protecting all your outdoor pieces through the colder months, our garden furniture buying guide covers frames, tables and covers alongside soft furnishings. When cushions are past saving, refreshing your cushions is an inexpensive way to make an existing set feel new again.
9. Buying with confidence
Even the best care routine has a shelf life, and sometimes a tired set of garden sofas and chairs deserves a proper refresh rather than another scrub. If you are updating your outdoor space, it helps to buy from somewhere that makes the whole process easy. At Elystra Living, garden orders come with fast tracked delivery, so you are not left waiting through the good weather, and a 30-day returns window gives you time to check everything suits your space and seating. You can also spread the cost with Klarna interest-free instalments, making it simpler to invest in weatherproof cushions, a new garden dining set or an outdoor rug to finish the look. Browse the full range of garden furniture and give your patio a fresh start this season.
Frequently asked questions
Can I put outdoor cushions in the washing machine?
Only if the care label specifically allows it and the covers are removable. Use a cool, gentle cycle with mild liquid detergent, no fabric softener, and turn printed covers inside out. Never machine wash sealed all-in-one cushions or the foam inners, and always air-dry rather than tumble drying.
How do I get the musty smell out of outdoor cushions?
A musty smell almost always means trapped damp or light mould in the foam. Sponge the cushion with a solution of equal parts white vinegar and water, leave it briefly, rinse, then dry it completely in a warm, airy spot or direct sunlight. The smell returns if the foam core is re-covered before it is fully dry.
Will bleach damage my garden cushions?
Household chlorine bleach can strip colour and weaken fibres on most printed and non-acrylic fabrics, so avoid it as a rule. Some solution-dyed acrylic covers tolerate a heavily diluted oxygen-based cleaner, but only where the label confirms it. Whatever you use, always test a hidden corner first.
How do I clean foam cushion inners?
Foam cannot be machine washed, so surface-clean it instead. Sponge both sides with mild soapy water, rinse by pressing clean water through and squeezing gently, then dry it thoroughly. Stand the foam on its edge in a warm, breezy spot and turn it often, as the core stays wet long after the surface feels dry.
Can I use a pressure washer on outdoor cushions?
It is best avoided. The high-pressure jet can tear stitching, damage waterproof coatings and force water deep into the foam where it is very hard to dry out. A garden hose on a gentle spray, or a bucket and soft brush, cleans just as well without the risk.
How often should I clean my outdoor cushions?
Give them a quick brush-down and wipe any spills weekly through the season, and do a deeper clean once or twice a year, typically at the start and end of summer. Regular light maintenance prevents the deep-set grime and mildew that make heavy cleaning necessary in the first place.
How do I stop mould coming back?
Keep cushions dry. Never leave them damp or stacked wet, bring them under cover before heavy rain, and store them somewhere dry and airy over winter in a breathable bag rather than sealed plastic. Ensuring the foam core is completely dry before re-covering is the single most effective preventative step.
Are removable covers worth it when buying new cushions?
Yes, zipped removable covers make cleaning far easier because you can wash them separately and dry the foam properly. When choosing new outdoor cushions, look for a hard-wearing, weather-resistant outer fabric and removable covers. Our guide on how to choose cushions explains what to look for in more detail.
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