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To do concrete surface cleaning, get the appropriate chemical concrete surface cleaner for the job and start by setting your pressure washer on low. Apply the detergent to the concrete surface and start working section by section. If you are working with concrete flooring, make sure you work with the slope to allow for drainage of water runoff. As with other types of surfaces, allow your detergent to sit for five to ten minutes before you get ready to rinse. Set your nozzle to high pressure and use a 40" spray tip for optimal conditions. Test a small area first when you're rinsing and then move section by section to remove the detergent. For heavily soiled areas, you may need to make several passes. Before you know it, you'll be done with the job!