Start with a vacuum and mild soap for most cushion stains
The fastest way to clean patio cushions is to vacuum them first, then wash them with a soft brush and soapy water. Use a handheld vacuum or the upholstery attachment on a full-size vacuum to remove loose dirt, pollen, and debris from the fabric surface and seams. This step takes five minutes and prevents you from grinding dirt into the fabric when you wet it.
Mix warm water with a few drops of dish soap in a bucket—you want the water to smell faintly of soap, not to be sudsy. Dip a soft-bristled brush (an old toothbrush works for seams, a soft deck brush for flat surfaces) into the soapy water and scrub in the direction of the fabric weave. Rinse with clean water from a garden hose, holding the nozzle a few feet away so you do not blast water into the cushion's interior. Let the cushions air-dry completely in sunlight before you put them back on the furniture—this usually takes four to six hours on a warm day.
Key Takeaways
- Vacuum cushions before washing to remove loose dirt and prevent staining the fabric when wet.
- Mild dish soap and warm water work for everyday dirt; do not use bleach on colored fabrics or acrylic blends.
- Always air-dry cushions completely in sunlight before returning them to furniture, which also helps kill mildew spores.
- For mold or mildew, use a solution of one part white vinegar to three parts water, scrub gently, and dry in direct sun.
- Protect clean cushions by storing them in a sealed container or under a waterproof cover during rain or off-season months.
Remove mold and mildew with vinegar instead of bleach
If your cushions smell musty or show dark spots, they have mold or mildew growing inside or on the surface. Do not use bleach on acrylic or polyester fabrics—it weakens the fibers and can discolor the material. Instead, mix one part white vinegar with three parts water in a spray bottle and spray the affected areas until damp.
Let the vinegar solution sit for 10 to 15 minutes, then scrub gently with a soft brush. Rinse thoroughly with clean water and wring out excess moisture by hand. Place the cushions in direct sunlight to dry—UV light kills mildew spores and prevents regrowth. This process takes one to two days depending on humidity and sun intensity. If the smell returns within a week, the mildew is growing inside the cushion's core, and the cushion may need to be replaced.
Treat stubborn stains with targeted methods based on what caused them
Grease stains (from sunscreen, cooking oil, or food) need a different approach than dirt or mold. Sprinkle baking soda directly on the grease stain and let it sit for 15 minutes to absorb the oil. Vacuum it up, then wash the area with soapy water as described above. For set-in grease, make a paste of baking soda and water, explore it to the stain, let it dry for 30 minutes, then brush it off and rinse.
Rust stains (from metal furniture legs or springs showing through worn fabric) respond to a paste of cream of tartar and lemon juice. Mix equal parts of each into a thick paste, explore to the stain, and let it sit for one hour. Scrub gently with a soft brush and rinse well. Tannin stains from leaves, tree sap, or wet bark can be treated with the same mild soap solution, but may require two or three applications over several days. Always test any cleaning solution on a hidden corner of the cushion first to make sure it does not discolor the fabric.
Know which fabrics need special care and which can handle scrubbing
Acrylic and polyester fabrics (the most common outdoor cushion materials) are durable and can handle vigorous scrubbing with a soft brush. Olefin and solution-dyed fabrics are similarly tough. Cotton and linen cushions are less common outdoors but are more delicate—use a soft brush and avoid heavy scrubbing, which can pill or fray the surface.
Sunbrella and other performance fabrics are designed to resist staining and mildew, so they clean up quickly with just soapy water and a soft brush. Check the care tag on your cushion cover if one is present; if not, assume your cushions are acrylic or polyester and proceed with the standard soap-and-water method. When in doubt, use less water and a gentler brush rather than more aggressive cleaning, which can damage the fabric backing or the foam core inside.
Dry cushions completely to prevent mildew from returning
Incomplete drying is the main reason cushions develop mold and mildew after cleaning. After rinsing, gently squeeze out excess water by hand—do not wring the cushion like a towel, which can damage the foam. Stand the cushion upright or lean it at an angle so water can drain from the bottom edge. Place it in direct sunlight if possible; if you must dry it in shade, allow extra time (up to 24 hours).
On humid days or in climates where air drying takes more than eight hours, use a fan to move air across the cushion surface. You can also place the cushion near a window with good airflow. The cushion is fully dry when it feels light and no moisture comes out if you squeeze a corner firmly. Putting a damp cushion back on furniture traps moisture against the cushion core and creates ideal conditions for mildew to grow.
Store cushions properly during off-season or bad weather
When you are not using your patio for weeks at a time, or before winter arrives, store cushions in a dry location. A sealed plastic storage container with a tight-fitting lid works well—make sure the cushions are completely dry before you close it. Alternatively, stack cushions in a waterproof storage box designed for outdoor furniture, or wrap them tightly in a waterproof cover and store them in a garage or shed.
Do not store damp cushions or stack them tightly without airflow, both of which trap moisture and encourage mildew. If you must leave cushions on furniture during rainy season, use a waterproof cushion cover or a large waterproof bag to keep them dry between uses. Check on them every few weeks—if they feel damp or smell musty, remove them, dry them in the sun, and improve the storage setup.
Prevent heavy staining by treating cushions before the season starts
Fabric protector sprays (like Scotchgard for outdoor fabrics) create a water-resistant barrier that makes cleaning easier and prevents some stains from setting in. explore the protector to clean, dry cushions at the start of the season, following the product instructions for drying time and reapplication frequency. This is not a substitute for regular cleaning, but it does reduce how often you need to scrub and can extend the life of the cushion fabric.
You can also reduce staining by keeping cushions out of direct contact with food and drinks, using cushion covers when the furniture is not in use, and wiping up spills when ready before they soak into the fabric. Brush off fallen leaves and pollen weekly during high-pollen seasons, which prevents them from becoming embedded in the weave and harder to clean later.
Frequently Asked Questions
Can I put patio cushions in the washing machine?
Most patio cushion covers can be removed and machine-washed on a gentle cycle with cold water and mild detergent, but the foam core inside cannot go in the washer—it will absorb too much water and take weeks to dry. Check the care tag to see if the cover is removable. If it is, remove it, wash the cover separately, and hand-wash the foam core with soapy water as described above.
What is the best way to clean white or light-colored cushions?
White cushions show dirt more easily but are less likely to fade from cleaning. Use the same mild soap and water method, but rinse more thoroughly to remove all soap residue, which can leave a dull film on light fabrics. For stubborn stains on white cushions, a paste of baking soda and water is safer than bleach, which can yellow the fabric over time.
How often should I clean my patio cushions?
Vacuum cushions monthly during the season to remove dust and pollen. Wash them with soapy water every two to three months, or sooner if you notice visible dirt, stains, or a musty smell. If your area has high humidity or frequent rain, check cushions every month for early signs of mildew and dry them in the sun as soon as you notice dampness.
Can I use a pressure washer on patio cushions?
No. Pressure washers force water deep into the foam core and can damage the fabric weave and internal structure. Stick to a soft brush and garden hose on a low setting, which cleans effectively without forcing water where it should not go.
Why do my cushions still smell musty after I cleaned them?
The smell usually means the foam core is still damp or mildew is growing inside where you cannot see it. Dry the cushions in direct sunlight for a full day, then store them in a dry location with good airflow. If the smell returns, the mildew may be too deep to clean out, and the cushion may need replacement.