Removing Mold and Mildew from Outdoor Cushions? By On 28 February 2024 in A Removing Mold and Mildew from Outdoor Cushions? Mixing 1 cup of bleach and a gallon of water can remove mould and mildew. For a non-bleach method, use white vinegar and water. Always spot-test first. Did you find this FAQ helpful? 0 0