What is the best way to rid my patio and walks of moss and algae?

Walks and patios that are in shaded areas tend to have more moss and algae growth than areas exposed to sunlight. Sandstone, which holds moisture and has a cut, smooth surface, becomes very slick from moss growth even in slightly shaded areas. Where possible, for long-term control, change the environment to minimize the potential for moss and algae growth. Limbing up surrounding trees to increase exposure to sunlight, and trimming and heading back plants will increase air circulation. Check that excess moisture drains away from the affected area. In areas where moss and algae need to be removed, power washing is an option, using high-pressure water to remove growth from the pavement areas. Products such as Mossicide, available from retailers, may also provide some temporary control but will need to be reapplied regularly. Some household solutions of vinegar or bleach may also be used, but care should be taken to ensure that run off from the patio or walks does not come in contact ...  more