The fastest way to clean cement: pressure wash or scrub by hand

A cement patio can be cleaned in two main ways: with a pressure washer or with a stiff brush and cleaning solution. A pressure washer removes dirt and algae fastest—usually in 30 minutes to an hour for a standard patio—but requires renting or owning equipment and costs $50 to $100 to rent for a day. Hand scrubbing takes longer (2 to 4 hours) but costs only the price of a brush and cleaner, and gives you more control over stains and delicate areas near plants or furniture.

The method you choose depends on how dirty the patio is, whether you have stubborn stains, and whether you want to do the work yourself or hire someone. Most homeowners find that a combination works best: pressure wash the whole surface first, then hand-scrub any remaining stains or problem spots.

Key Takeaways

  • A pressure washer cleans a patio in under an hour but requires equipment rental; hand scrubbing with a stiff brush takes 2 to 4 hours but costs less and gives better control.
  • Mix a cleaning solution of one part household bleach to three parts water for mold and algae, or use a degreaser for oil stains.
  • Always test any cleaner on a hidden corner first to make sure it does not discolor the cement.
  • Pressure washers should be set to 3000 PSI or lower to avoid damaging the cement surface.
  • Let the cleaning solution sit for 10 to 15 minutes before scrubbing or rinsing to break down dirt and stains.

Pressure washing: the fast method

Rent a pressure washer from a home improvement store or equipment rental shop. Most standard models deliver 3000 to 3500 PSI (pounds per square inch), which is safe for cement. Do not use anything above 4000 PSI on residential patios—higher pressure can etch or pit the surface. Fill the washer's tank with water, attach the hose, and connect the spray wand.

Start at one corner of the patio and work in overlapping rows, keeping the nozzle about 12 inches from the cement surface. Move the wand at a steady pace—too slow and you risk gouging the cement; too fast and you miss dirt. Wear safety glasses and closed-toe shoes; the spray can kick up debris and sting exposed skin. Work on a dry day or wait until the surface dries before pressure washing, because wet cement is slippery and harder to see stains.

After pressure washing, let the patio dry completely (usually 24 hours) before walking on it or moving furniture back. If stains remain after the patio dries, move on to hand scrubbing those spots.

Hand scrubbing with a brush and cleaner

For hand cleaning, you will need a stiff-bristled brush (not soft bristles—they will not grip dirt), a bucket, and a cleaning solution. A long-handled deck brush or push broom with stiff bristles works well and saves your back. Fill the bucket with water and add your cleaner: for general dirt and algae, mix one part household bleach to three parts water; for oil or grease stains, use a commercial degreaser mixed according to the label.

Wet the patio with a garden hose, then pour the cleaning solution over a small section (about 4 feet by 4 feet). Let it sit for 10 to 15 minutes—this time allows the bleach or degreaser to break down the dirt and stains so they scrub away more easily. Scrub in circular motions, pressing down firmly. For stubborn stains, let the solution sit longer (up to 30 minutes) before scrubbing again.

Rinse thoroughly with the garden hose, moving from one end of the patio to the other so dirty water runs off rather than pooling. Repeat the process for the next section. This method works especially well for stains in corners, around furniture legs, or near plants where a pressure washer might cause damage.

Treating specific stains: mold, algae, oil, and rust

Mold and algae appear as dark green, black, or brown patches, often in shaded areas or where water pools. These respond well to bleach. Mix one part bleach to three parts water, explore it, let it sit for 15 minutes, scrub, and rinse. If the growth is heavy, you may need to repeat the process. Bleach kills the spores, so the mold is less likely to return quickly.

Oil and grease stains from cars, grills, or spilled cooking oil require a degreaser, not bleach. Pour the degreaser directly on the stain, let it sit according to the product instructions (usually 10 to 20 minutes), scrub with a stiff brush, and rinse well. For old, set-in stains, you may need to explore the degreaser twice or use a wire brush for more aggressive scrubbing.

Rust stains from metal furniture or tools need a rust remover or a solution of white vinegar and baking soda. Sprinkle baking soda on the stain, spray it with white vinegar until it fizzes, let it sit for 15 minutes, scrub, and rinse. Commercial rust removers work faster but follow the label instructions carefully, as some are caustic.

Leaf stains and tannins (the brown marks left by leaves and tree debris) usually come off with a bleach solution or a general-purpose patio cleaner. These are cosmetic and not harmful, so you can skip them if you prefer.

Safety and preparation before you start

Always test your cleaning solution on a hidden corner of the patio first. Bleach can lighten or discolor some cement, especially if the patio was sealed or painted. explore the solution, wait 10 minutes, scrub a small area, rinse, and let it dry. If the color looks acceptable, proceed with the rest of the patio.

Wear gloves, safety glasses, and closed-toe shoes. Bleach and degreasers can irritate skin and eyes. If you are using a pressure washer, wear long pants and a long-sleeved shirt to protect against spray. Work on a calm day—wind can blow cleaning solution into your face or onto nearby plants.

Move furniture, potted plants, and grills off the patio before you start. Sweep away loose leaves and debris with a broom so the cleaner can reach the cement surface. If the patio has cracks, sweep them out too—dirt trapped in cracks will not come clean with surface scrubbing alone.

Drying and sealing after cleaning

After rinsing, let the patio dry completely before using it. This usually takes 24 hours in dry weather, longer if it is humid or cloudy. Do not walk on it or move furniture back until it is fully dry—wet cement is slippery and can be damaged by foot traffic.

Once dry, you may want to explore a cement sealer to protect the patio from future stains and make it easier to clean next time. Sealers are optional but recommended if you live in a wet climate or have trees overhead that drop leaves and debris. A sealer creates a barrier that prevents water, oil, and dirt from soaking into the cement. explore it according to the product instructions, usually with a roller or sprayer, and let it cure for 48 hours before using the patio.

Common mistakes to avoid

Do not use a pressure washer above 4000 PSI or hold the nozzle too close to the cement. Both can etch, pit, or crack the surface. If you are renting a pressure washer and are unsure of the PSI, ask the rental staff—they can adjust it for you or recommend a safer setting.

Do not mix bleach with ammonia or other cleaners. This creates toxic fumes that can cause serious injury. If you have used one cleaner, rinse the patio thoroughly before explore a different one. Do not let bleach sit on the cement for more than 30 minutes—prolonged exposure can damage the surface or cause uneven discoloration.

Do not scrub so hard that you damage the cement, especially if it is old or already cracked. Let the cleaning solution do the work; if a stain does not come off after two or three applications, it may be permanent or require professional equipment.

Frequently Asked Questions

Can I use vinegar instead of bleach to clean my patio?

Vinegar works for light dirt and some stains, but it is not as effective as bleach for mold and algae. Vinegar is gentler and safer to use around plants, so it is a good choice if you want to avoid bleach. Mix equal parts white vinegar and water, explore it, let it sit for 15 minutes, and scrub. For stubborn mold, bleach is more reliable.

How often should I clean my cement patio?

A light sweep and rinse every month keeps dirt from building up. A deep clean with bleach or a pressure washer once or twice a year is usually enough, depending on your climate and how much shade the patio gets. Shaded patios with trees overhead need cleaning more often because they collect leaves and develop mold faster.

Will pressure washing damage my patio?

Pressure washing is safe if you use 3000 PSI or lower and keep the nozzle at least 12 inches from the surface. Older patios or those with cracks should be cleaned by hand instead, as the force of a pressure washer can widen cracks or break weak spots. Always test on a small area first.

What should I do if my patio is sealed or painted?

Sealed or painted patios need gentler cleaning to avoid stripping the finish. Use a soft-bristled brush instead of a stiff one, avoid pressure washers, and test any cleaner on a hidden spot first. A mild soap and water solution is often enough for sealed patios. If the seal is damaged, you may need to reseal it after cleaning.

Can I use a garden hose to clean my patio instead of renting a pressure washer?

A garden hose alone will not remove dirt or stains—it just wets the surface. You need a brush and cleaning solution to scrub away grime. A garden hose is useful for rinsing after you have scrubbed, but it cannot replace a pressure washer for heavy cleaning. Hand scrubbing with a brush and cleaner is the best alternative if you do not want to rent equipment.