If your patio is shaded by tall buildings, you're right to worry about mildew on your outdoor furniture. The lack of direct sunlight and potential for trapped moisture creates a perfect environment for mildew and mold growth. However, the risk heavily depends on your furniture's material.
Some materials naturally resist mildew. Synthetic resins (like polypropylene or polyethylene), powder-coated aluminum, and teak wood are excellent choices for shaded areas. They are less porous and either dry quickly or contain natural oils that inhibit mold growth. Avoid porous materials like untreated wood, certain fabrics, and low-quality cushions unless they are specifically treated for mildew resistance.
To prevent mildew, prioritize airflow. Arrange furniture with space between pieces and walls. Use protective, breathable covers instead of plastic tarps, which trap moisture. Clean furniture regularly with a mild soap solution and consider a vinegar-water spray for existing mildew. For cushions, choose quick-dry foam and removable, washable covers.
By selecting the right materials and maintaining good practices, you can enjoy your urban oasis without the worry of unsightly and unhealthy mildew.