How to Clean Outdoor Cushions: Remove Mildew, Stains, and Deep Grime
Outdoor cushions accumulate pollen, bird droppings, mildew, sunscreen, and general weather grime over a season. Most outdoor cushion fabric can be cleaned with dish soap and water for routine cleaning, or a diluted bleach solution for mildew. The key is knowing what type of fabric you have and how much water is safe. Here’s the complete method.
What You’ll Need
- Garden hose with spray nozzle
- Bucket of warm water
- Dish soap
- White vinegar (for mildew)
- Bleach (for heavy mildew — only on white or colorfast fabric)
- Soft-bristle scrub brush
- Dry towels
- Rubber gloves
Safety and Precautions
Check the fabric cleaning code on your cushion covers before cleaning. W means water-based cleaners; S means solvent only; WS means either; X means vacuum only. Most outdoor cushion fabrics (Sunbrella, polyester, acrylic) are W or WS. Never use bleach on colored non-colorfast fabric — test in an inconspicuous spot first. If using bleach, see our cleaning products safety guide — never mix bleach with vinegar.
How to Clean Outdoor Cushions Step by Step
Brush Off Dry Debris
Before introducing water, brush off loose dirt, pollen, and dry debris with a dry brush or shake the cushions vigorously. Getting dry debris off first prevents it from spreading as mud when wet.
Pre-Rinse with Garden Hose
Lay cushions flat on a clean surface and rinse with a garden hose. This removes light surface dirt and pre-wets the fabric for better cleaning penetration.
Apply Soap Solution and Scrub
Mix 2 tablespoons of dish soap per gallon of warm water. Apply to the cushion fabric with a soft brush and scrub in circular motions. Work the solution into the fabric. Pay extra attention to stained areas, seams, and edges where grime concentrates.
Treat Mildew Spots
For black or dark gray mildew spots, apply white vinegar directly to the spots and let sit 10 minutes before scrubbing. For heavy mildew on white or colorfast fabric, a solution of 1 tablespoon bleach per gallon of water can be applied, let sit 5–10 minutes, then scrubbed. Always test bleach on an inconspicuous spot first. For in-depth mildew treatment, see our mildew removal guide.
Rinse Completely
Rinse thoroughly with the garden hose until the water runs completely clear. Any soap residue left in the fabric attracts new dirt faster and can cause fabric stiffness. Squeeze the fabric to check — if water still has bubbles, keep rinsing.
Dry Standing Upright in Sunlight
Stand cushions on their edge in direct sunlight to air dry. This allows air to circulate on both sides and uses UV to help kill remaining bacteria and mildew spores. Don’t put cushions back on furniture while still damp — moisture trapped between the cushion and frame causes accelerated mildew growth.
Cleaning Cushion Covers vs. Full Cushions
If your cushions have removable covers with zippers, remove them and machine wash if the care label allows — typically on cold, gentle cycle. This produces a more thorough clean than hand-washing. Air dry (dryer heat can shrink or warp zipper hardware). Cushion inserts (foam) typically can’t be machine washed but can be hand-washed in a bathtub with soapy water, then thoroughly squeezed and dried standing upright.
Pro Tips for Outdoor Cushion Care
- Store cushions when not in use: Bringing cushions inside or into a storage box during rain and at season end dramatically reduces cleaning effort and extends cushion life.
- Cover cushions when outside long-term: Furniture covers keep cushions much cleaner between uses and reduce UV fading. See our outdoor furniture cleaning guide for cover recommendations.
- Apply fabric protector spray after cleaning: A silicone-based outdoor fabric protector (like Scotchgard) repels water and stains, making future cleaning much easier. Apply after the cushion is completely dry.
Frequently Asked Questions
How do I remove mildew from outdoor cushions?
Apply undiluted white vinegar to mildew spots, let sit 10 minutes, scrub with a soft brush, and rinse. For heavy mildew on colorfast fabric, a diluted bleach solution (1 tbsp per gallon) is more effective. Dry completely in sunlight after treatment — UV kills remaining spores.
Can outdoor cushions go in the washing machine?
Removable cushion covers (with zippers) can typically be machine washed on cold gentle cycle if the care label confirms it. Whole cushions with non-removable covers should be hand-washed. Always check the cleaning code tag — S-coded fabrics can only be dry-cleaned.
How do I get sunscreen stains off outdoor cushions?
Apply dish soap directly to the stain and work it in with a brush. Let it sit 15 minutes before rinsing. Sunscreen is oil-based — dish soap cuts through oil better than other household cleaners. For set-in stains, an enzyme-based fabric cleaner (like Zout) breaks down the residue more completely.
How do I prevent outdoor cushions from getting moldy?
Store them in a dry place when not in active use, bring them inside before rain if possible, and ensure they dry completely before storage. A fabric protector spray after cleaning creates a water-repellent layer that prevents moisture absorption — the primary cause of mold in outdoor cushions.
How often should outdoor cushions be cleaned?
A deep clean once or twice per season (spring and fall) is the baseline. If you live in a humid climate or use your outdoor space heavily, monthly cleaning during the season prevents buildup. Spot-clean spills and bird droppings immediately — fresh stains are dramatically easier to remove than dried ones.
Conclusion
Clean outdoor cushions make your patio feel fresh and extend the life of what can be an expensive investment. The dish soap scrub and thorough rinse handles routine cleaning; vinegar or diluted bleach handles mildew. Store and cover cushions when not in use and apply a fabric protector after each cleaning to make the next cleaning even easier. For cleaning the furniture frames that hold these cushions, check our outdoor furniture cleaning guide.
