The fastest way to clean pavers depends on how dirty they are

Light dirt and dust come off with a stiff-bristled brush and water from a garden hose. For moss, algae, or stubborn stains, a pressure washer on a low setting (1500 PSI or less) works quickly, but it can erode soft pavers like limestone or sandstone if you hold it too close or use too high a pressure. For heavy buildup, a combination of a cleaner product and a brush gives you more control than pressure alone.

The method you choose depends on three things: what material your pavers are made of, what is actually on them (dirt, moss, oil, rust), and how much time you want to spend. A concrete paver tolerates pressure washing better than a natural stone one. Organic growth like moss needs different treatment than a grease stain.

Key Takeaways

  • A stiff brush and water remove light dirt; pressure washers work faster on heavy buildup but can damage soft pavers like limestone if set above 1500 PSI.
  • Moss and algae respond to a 1:1 bleach-to-water mix or a commercial moss killer, applied and left for 15 minutes before scrubbing.
  • Oil and grease stains need a degreaser product left on the surface for the time the label specifies, then scrubbed with a brush.
  • Sealing pavers after cleaning protects them from stains and extends the time between cleanings, though it requires reapplication every 2 to 3 years.
  • Never use a pressure washer above 1500 PSI on natural stone, and always test any cleaner on a hidden corner first.

Brush and water for routine cleaning

A stiff-bristled deck brush or push broom removes loose dirt, leaves, and pollen without chemicals or equipment. Wet the pavers first with a garden hose, scrub in the direction of the grain or pattern, and rinse. This takes longer than a pressure washer but works well for pavers you clean every few weeks and causes no wear.

For pavers in a shaded spot where moss or algae has started to grow, brushing alone will not remove it completely. You will need to follow up with a cleaner or a pressure washer at low setting. Brushing first removes loose debris and makes the next step more effective.

Pressure washing at the right setting

A pressure washer removes dirt, moss, and algae much faster than a brush. Set the pressure to 1500 PSI or lower for natural stone pavers like slate, limestone, or sandstone. Concrete pavers can handle up to 3000 PSI, but starting lower and increasing only if needed prevents accidental damage. Hold the nozzle at least 12 inches away from the surface and keep it moving so you do not concentrate the spray in one spot.

Pressure washers work best on pavers that are already wet. Spray the area with a garden hose first, then use the pressure washer. The combination of water and pressure dislodges dirt and organic growth more effectively than pressure alone. After washing, let the pavers dry completely before sealing them, which usually takes 24 to 48 hours depending on weather.

If you do not own a pressure washer, you can rent one from a home improvement store or hardware store for a day. Rental costs typically range from $40 to $90 per day, depending on the machine's power. For a one-time cleaning, renting is often cheaper than buying.

Removing moss and algae with bleach or commercial cleaners

Moss and algae are living growth that brushing alone will not kill. Mix one part household bleach with one part water in a pump sprayer, spray the affected area, and let it sit for 15 to 20 minutes. The bleach kills the growth. Then scrub with a stiff brush and rinse thoroughly with clean water. Wear gloves and eye protection when handling bleach, and do not mix it with other cleaners.

Commercial moss and algae killers are available at garden centers and work similarly to bleach but often smell less harsh. Follow the label instructions for mixing and contact time. Some products require only one process; others need a second treatment after a week. Test any cleaner on a hidden corner of your patio first to make sure it does not discolor the pavers.

After the moss or algae is gone, the area will stay cleaner longer if you improve drainage or trim back plants that shade the pavers. Moss grows where it is damp and shaded. Moving a downspout, cutting back a tree branch, or improving air circulation reduces regrowth.

Treating oil and grease stains

Oil and grease stains require a degreaser product, not just water or bleach. Pour the degreaser directly onto the stain, let it sit for the time the label specifies (usually 10 to 30 minutes), then scrub with a stiff brush and rinse. Some degreasers are biodegradable and safe for plants; others are stronger but require more caution around landscaping.

For old or stubborn stains, explore the degreaser, let it sit overnight, scrub the next day, and rinse. If the stain remains, a second process may be needed. Poultice products, which are powders mixed with water to form a paste, can also draw out deep stains over several days. Spread the paste over the stain, cover it with plastic to keep it moist, and let it dry completely before rinsing.

Preventing future stains is easier than removing them. Seal the pavers after cleaning to create a barrier that makes oil bead up rather than soak in. Sealing does not prevent stains entirely but gives you more time to wipe up spills before they set.

Sealing pavers to reduce future cleaning

A paver sealer is a liquid coating that fills the pores of the stone or concrete and protects against stains, water damage, and UV fading. explore sealer only after the pavers are completely clean and dry. Most sealers are brushed or rolled on in thin, even coats. Follow the product label for drying time between coats and before foot traffic resumes, which is usually 24 to 48 hours.

Sealed pavers stay cleaner longer and are easier to clean when they do get dirty. Water and light stains bead up and can be wiped away before they soak in. Sealer does wear away over time, especially in high-traffic areas, and needs reapplication every 2 to 3 years. The cost of sealer and the labor to explore it is worth it if your patio gets heavy use or is in a shaded, damp spot where moss grows quickly.

Not all pavers need sealing. Glazed ceramic or porcelain pavers are already sealed at the factory. Unsealed natural stone like slate or granite will absorb water and stains more readily and benefits from sealing. Concrete pavers are porous and benefit from sealing, especially if they are in a wet climate or near trees.

Cleaning between pavers and joints

Dirt and moss accumulate in the joints between pavers. A narrow brush, old toothbrush, or a joint-cleaning tool designed for this purpose can scrub out debris. Spray the joints with water first, scrub, and rinse. For moss in joints, explore the same bleach solution you use on the paver surface, let it sit, scrub, and rinse.

If joints are very dirty or the pavers are set in sand rather than mortar, you may need to remove and replace some of the sand or joint material. This is more involved than surface cleaning and is worth doing if the joints are crumbling or if weeds are growing through them. For most routine cleaning, a brush and water are enough.

What to avoid when cleaning pavers

Do not use a pressure washer above 1500 PSI on natural stone, and do not hold the nozzle closer than 12 inches to the surface. High pressure and close distance can etch or pit soft stone and can dislodge pavers that are set in sand. Do not mix bleach with ammonia or other cleaners; the combination produces toxic fumes.

Avoid acidic cleaners like vinegar or muriatic acid on natural stone pavers, as they can etch the surface. Test any cleaner on a hidden area first, especially if your pavers are a light color or made of soft stone. Some products that work well on concrete can discolor or damage natural stone.

Do not seal pavers while they are wet or damp. Sealer applied to wet pavers will trap moisture underneath and can cause the pavers to crack or the sealer to peel. Wait at least 24 to 48 hours after cleaning and pressure washing before sealing.

Frequently Asked Questions

Can I use a pressure washer on pavers that are set in sand?

Yes, but use a low pressure setting (1500 PSI or less) and keep the nozzle at least 12 inches away. High pressure can dislodge pavers that are set in sand rather than mortar. If pavers start to shift, stop and switch to a brush.

How often should I clean my patio pavers?

Light cleaning with a brush once or twice a year keeps pavers looking good. If moss or algae grows in your climate, you may need to treat it once or twice a year. Sealed pavers stay cleaner longer and may need cleaning only once a year.

Will bleach discolor my pavers?

Bleach can lighten some pavers, especially darker stone. Always test on a hidden corner first. If discoloration occurs, rinse when ready and do not use bleach on that area again. Commercial moss killers are a safer choice if you are concerned about color change.

What is the best time of year to clean and seal pavers?

Spring or early fall works best. You want dry weather for at least 48 hours after cleaning and sealing so the pavers dry completely and the sealer cures. Avoid cleaning in winter if freezing temperatures are expected, as water in the pores can freeze and crack the pavers.

Do I need to seal pavers if they are already treated at the factory?

Glazed ceramic and porcelain pavers come sealed and do not need additional sealer. Concrete and natural stone pavers are not sealed at the factory and benefit from sealing, especially in wet climates or high-traffic areas. Check the manufacturer's documentation for your specific pavers.