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Leaves and dirt may stain concrete. Pressure washing can remove these soils and restore original brightness to concrete and coping stones. A light acid washing on the coping stones also works very well, and algae or mildew can be lifted by scrubbing with a paste of bleaching agent. If you do not have any cleaning agent on hand, you can try powdering the area with Baking Soda and then spraying it with vinegar before you scrub it with a brush.