The best way to clean the concrete around your concrete swimming pool is by using a pressure washer. This will help to remove any dirt, grime, and debris that may have accumulated over time. Once you've finished pressure washing, it is important to use a brush and detergent to scrub away any stubborn stains or build-up. Finally, rinse off the area with clean water and allow it to dry completely before using the pool again. Consider also employing a professional pool company to provide this service on a scheduled basis.