How to Clean Outdoor Cushions
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The short answer
Brush off debris, pre-treat stains, then wash with warm water and a mild soap — or a 1:4 oxygen bleach solution for mildew on solution-dyed acrylic. Rinse until the water runs clear and dry cushions standing on edge in the sun for a full day. Incomplete drying is the reason mildew comes back.
Outdoor Fabric Cleaner
Safe on solution-dyed acrylic and printed polyester alike, unlike chlorine bleach.
Outdoor cushion fabric falls into two useful groups: solution-dyed acrylic (Sunbrella and similar), which tolerates bleach, and printed polyester, which does not. Getting that wrong is how cushions come out blotchy.
Identify the Fabric First
| Fabric | Bleach safe? | Cleaner |
|---|---|---|
| Solution-dyed acrylic | Yes, diluted | Mild soap; oxygen or dilute chlorine bleach for mildew |
| Printed polyester | No | Mild soap only; oxygen bleach spot-tested |
| Olefin / polypropylene | Oxygen only | Mild soap, oxygen bleach |
| Cotton canvas | No | Mild soap, air dry out of direct sun |
The Method
- 1Vacuum or brush off loose dirt, pollen and cobwebs.
- 2Pre-treat stains: dish soap for grease and sunscreen, oxygen bleach paste for mildew spots.
- 3Mix warm water with mild soap in a bucket. For mildew on acrylic, use oxygen bleach per label.
- 4Sponge or soft-brush the whole cushion so you do not leave a clean patch around the stain.
- 5Let it dwell 15 minutes, then scrub gently.
- 6Rinse thoroughly until no suds appear — residue attracts dirt and holds moisture.
- 7Stand cushions on edge in the sun for a full day, turning once.
Myth
You can machine wash outdoor cushion covers.
The Fact
Some covers are removable and washable, but check the tag. Machine washing can strip the water-repellent finish, and the foam insert almost never survives a spin cycle intact.
Specific Stains
- Mildew: oxygen bleach, 15-minute dwell, full rinse. Then fix why they were stored damp.
- Sunscreen and body oil: dish soap first — it is a grease stain, not a dye stain.
- Bird droppings: soften with water, lift with a plastic edge, then wash. Never scrub dry.
- Tree sap: rubbing alcohol on a cloth, blotting from the outside in.
- Rust from a frame: oxalic acid rust remover, spot-tested. Then paint the frame.
Restore Water Repellency
Cleaning strips the factory water-repellent finish. After the cushions are fully dry, re-treat with a fabric guard spray made for outdoor upholstery. Water should bead again, which is also what keeps mildew from setting in.
Frequently Asked Questions
- Can I pressure wash outdoor cushions?
- No. Pressure drives water deep into the foam and damages the fabric weave. Use a hose and a soft brush.
- How do I dry cushions faster?
- Stand them on edge, not flat, and press out water with towels first. Direct sun and a breeze do the rest; a full day is normal.
- Will vinegar remove mildew from cushions?
- It helps on light surface mildew but does not clear staining. Oxygen bleach is far more effective and is safe on most outdoor fabrics.
- How often should cushions be cleaned?
- A rinse and brush monthly in season, plus one deep clean before storage. The pre-storage clean matters most.
The Gear We’d Buy
Everything referenced in this guide, in one place.
Outdoor Fabric Cleaner
Top pickSafe on solution-dyed acrylic and printed polyester alike, unlike chlorine bleach.
Typically $15 – $30
Oxygen Bleach Powder
The mildew treatment for outdoor fabric — spot test printed polyester first.
Typically $18 – $35
Fabric Guard Water Repellent Spray
Cleaning strips the factory finish. Re-treat once dry so water beads again.
Typically $15 – $28
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Key Takeaways
- Identify the fabric before choosing a cleaner — acrylic and printed polyester differ.
- Clean the whole cushion, not just the stain, to avoid blotches.
- Dry on edge for a full day; trapped moisture is what regrows mildew.
- Re-apply a fabric guard after cleaning to restore water beading.
Reviewed by
The Lawn Tool Hub Test Bench
We buy, borrow and break lawn tools on our own yards — clay in the back, sand-cut Bermuda in the front — and write down what actually changed the result.
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Top pick
Outdoor Fabric Cleaner