How to Deep Clean Your Concrete Patio

Concrete surfaces are the workhorses of your backyard, but over time, they collect stubborn layers of dirt, moss, and grease that make the patio look years older than it is. A clean patio isn't just about appearances; it prevents the surface from becoming slippery when wet and stops debris from harboring mold that can eventually pit the concrete finish. Getting this done right requires moving past just spraying it with a hose. You need to strip away the organic buildup and surface stains without using chemicals so harsh they etch the stone or kill your surrounding landscaping. With the right technique, you can take a gray, grimy slab and turn it into a bright, clean extension of your living space.

1. Expose the entire surface. Remove all patio furniture, grills, and potted plants to expose the entire surface. Use a stiff-bristled push broom to sweep away loose leaves, dirt, and debris.
2. Attack the worst spots first. Apply a dedicated concrete degreaser or a paste of baking soda and water to heavy oil or grease spots. Let the cleaner dwell on the surface for at least 15 minutes to break down the bond.
3. Coat the entire patio. Mix a mild concrete cleaner or a solution of dish soap and warm water in a large bucket. Apply the mixture over the entire patio using a mop or a long-handled brush.
4. Work the cleaner deep. Using a stiff push broom, scrub the patio in a circular motion to lift the dirt out of the concrete pores. Pay extra attention to corners and areas where moss is visible.
5. Blast away the grime. Use a pressure washer set to a low or medium PSI to rinse away the soapy water and lifted debris. Move the wand in sweeping, overlapping motions from the center toward the edges.
6. Rinse and let dry. Give the patio one final pass with a standard garden hose to clear away any remaining soap suds or stubborn debris. Let the concrete air dry completely before replacing your furniture.