How do you prevent algae buildup on shaded concrete outdoor sofa surfaces?

Algae buildup on shaded concrete outdoor sofas can be unsightly and slippery, posing a safety hazard. To prevent algae growth, start by ensuring proper drainage around the sofa to avoid moisture accumulation. Regularly clean the surface with a mixture of water and white vinegar or a mild detergent to remove dirt and organic matter that algae feed on. For stubborn algae, use a solution of bleach and water (1:10 ratio) or a commercial algae remover, but rinse thoroughly afterward to avoid damaging the concrete. Applying a sealant to the concrete surface can also create a protective barrier against moisture and algae. Additionally, trim nearby vegetation to improve airflow and reduce shade, as algae thrive in damp, low-light conditions. By following these steps, you can keep your outdoor sofa clean and algae-free.