How to Clean and Seal Concrete Pavers

Concrete pavers are the backbone of a functional patio, but they are porous sponges that soak up everything from tire marks to spilled drinks. Over time, sunlight breaks down the original factory finish, leaving the stone dull and susceptible to staining. A well-maintained paver surface should shed water like a freshly waxed car, signaling that the substrate is protected from moisture-induced cracks and freeze-thaw damage. Restoring your pavers isn't just about curb appeal; it is a structural necessity for long-term durability. By cleaning deeply and sealing the pores, you stop weed growth between the joints and prevent oil or moss from setting in permanently. When done well, the process leaves the surface uniform, protected, and significantly easier to spray down with a hose for the next several seasons.

Clear the Deck First. Remove all patio furniture, grills, and potted plants from the area. Sweep the surface thoroughly with a stiff-bristled broom to remove loose debris, dirt, and leaves.
Eliminate Joint Invaders. Pull any weeds growing between the joints by hand or with a weeding tool. If moss or algae is present, spot-treat the area with a paver-safe cleaner and a wire brush.
Blast Away Built-Up Grime. Use a pressure washer with a wide-angle fan tip to wash the entire area. Keep the nozzle moving constantly to avoid 'wand marks' or etching the concrete surface.
Lock in the Sand. Once the surface is completely dry, pour polymeric sand into the gaps between the pavers. Use a broom to sweep the sand into the joints until they are filled to within 1/8 inch of the paver surface.
Bond the Joint Seal. Lightly mist the pavers with a hose to settle the polymeric sand. Avoid over-watering, as this can wash out the binding agents necessary for a tight, weed-proof seal.
Protect with Lasting Finish. Using a pump sprayer or a high-quality roller, apply an even coat of concrete sealer to the dry, clean surface. Work in sections to ensure the material does not puddle in low spots.