I and/or hubby do it ourselves with an electric power washer. It's easy. Most of the time we don't use anything other than the power of plain water and that removes bugs, webs, dirt and stains. The lanais tend to get dirty and it's nice to be able to hose of the screens and concrete on a more regular basis. Most machines come with different attachments for varying the flow of the water. Weaker for screens and windows and stronger for concrete. Good investment and you'll likely do a better job than someone you hire.
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