How To Clean Sunbrella Fabric Cushions. Then apply a light mist of mild soap and water to the spot using a spray bottle. Allow fabric to air dry.
If you have severe mildew, a stronger bleach solution can be used without harming sunbrella fabrics. Allow sunbrella to completely air dry. 303 should be applied to sunbrella fabrics after each thorough cleaning, which typically removes the original finish and reduces the fabric’s water repellency.
Spray on a mild cleaning solution of soap (such as dawn® or woolite®) and water.
To clean mildew, or other stubborn stains: With a new spill on your sunbrella fabric. Use for cushions, pillows, patio furniture, upholstery projects, and gazebos. Mix 8 ounces of bleach, 2 ounces of mild soap and a gallon of water.