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How to Clean Concrete with a Pressure Washer

Man cleaning concrete surface.

Concrete surfaces around your home can collect dirt, grime, algae, and other contaminants over time, leaving them looking dull and uninviting. Pressure washing is one of the most effective ways to restore the appearance of your concrete. Here’s an overview on how to clean concrete with a pressure washer safely and effectively.

Can You Power Wash Concrete?

Yes, you can power wash concrete, and it’s a highly effective method for cleaning. Pressure washing uses a high-powered water stream to remove built-up dirt, oil stains, algae, and mildew. However, it’s important to use the right equipment and techniques to avoid damaging your concrete surface.

Basic Tips for Pressure Washing Concrete

Here are a few practical tips to ensure that you get the best results when pressure washing concrete:

Use the Right Pressure Settings

Concrete is tough, but it can still get damaged if the water pressure is too high. Set the pressure washer to about 3,000 PSI (pounds per square inch) for standard residential concrete cleaning. Too much pressure can etch the surface, while too little may not effectively clean it.

Choose the Right Nozzle

For most concrete cleaning tasks, a 25-degree nozzle works best. This nozzle provides enough pressure to clean thoroughly without damaging the surface. Avoid using a zero-degree nozzle, which can be too intense for concrete.

Maintain Proper Distance

Keep the nozzle about 12 inches away from the concrete surface while cleaning. Moving the nozzle too close can cause surface damage, while holding it too far may reduce the effectiveness of the cleaning.

💡 Fun Fact:

Frank W. Ofeldt II accidentally invented the first steam pressure washer in 1926 while working at a Pennsylvania company that produced gas-fired water heaters.

How to Prepare a Concrete Surface Before Pressure Washing

Before you start pressure washing, it’s essential to prepare the concrete surface properly. Here’s what you should do:

  • Clear the Area: Sweep away any loose debris like leaves, dirt, and rocks. This helps prevent them from becoming projectiles during power washing.
  • Cover Nearby Areas: Use plastic sheeting and painter’s tape to protect any nearby surfaces, such as windows, siding, or plants. The powerful spray from a pressure washer can damage delicate surfaces and plants.
  • Apply a Cleaning Solution: For tougher stains like oil or grease, applying a concrete cleaning solution beforehand can help break down the grime. Use a scrub brush to work the cleaner into the concrete, then rinse it off with the pressure washer.

What Pressure Washer Should I Use for Concrete?

Choosing the right pressure washer for your project depends on the size of the area you need to clean and the level of dirt buildup. Here are a few options:

  • Small Electric Pressure Washers: These are great for smaller areas like patios and driveways. They typically produce up to 2,000 PSI, which is sufficient for light-duty cleaning.
  • Gas-Powered Pressure Washers: For larger jobs or more heavily soiled surfaces, gas-powered models with 3,000 to 4,000 PSI offer the power needed to remove tough grime and stains.
  • Hot vs. Cold Water Models: Hot water pressure washers are more effective for removing oil stains and heavy grime, but they’re also more expensive. Cold water models are sufficient for most homeowners and work well on typical dirt and algae.

💡 Fun Fact:

Pressure washers use less water than a garden hose to clean the same area, making them surprisingly eco-friendly.

Post-Washing Maintenance for Concrete Surfaces

After pressure washing your concrete, regular maintenance will help keep it clean and looking fresh:

  • Regular Sweeping and Rinsing: Sweep the surface frequently to remove dirt and debris. For light maintenance, rinse the concrete with a garden hose once a month to prevent buildup.
  • Seal the Surface: Consider applying a concrete sealer after washing to protect the surface from stains and water damage. A good sealer can extend the lifespan of your concrete and keep it looking its best.
  • Inspect for Damage: After cleaning, take a moment to inspect the concrete for any cracks or damage that may have been hidden by dirt. Prompt repairs can prevent more serious issues down the road.

What Happens if You Don’t Pressure Wash Concrete?

If you don’t pressure wash your concrete, dirt, algae, and stains will accumulate, leaving the surface dull and discolored. Over time, mold and mildew can grow, creating slippery and unsafe areas.

Flaking, discolored concrete.

Without regular cleaning, concrete can also develop more serious issues like pitting, flaking, and deep staining. This damage weakens the surface, making it more vulnerable to cracking, especially in areas that experience freezing temperatures.

Dirty concrete also reduces your home’s curb appeal, potentially making it look neglected. Regular pressure washing helps prevent these problems, keeping your concrete clean, safe, and in good condition.

Pressure Wash Your Concrete to Keep it Safe

Groundworks inspector meeting with homeowners outside their house.

Concrete pressure washing is a straightforward process that can dramatically improve the look of your home’s exterior. By following these steps and using the right equipment, you’ll get excellent results while ensuring your concrete stays in great condition for years to come.

Looking for professional help with your concrete? Contact Groundworks today for expert advice and concrete leveling services!

Concrete Pressure Washing FAQs

It’s recommended to pressure wash concrete once a year to prevent dirt, grime, and algae buildup. High-traffic or moisture-prone areas may need more frequent cleaning.

Yes, using too much pressure or the wrong nozzle can damage concrete by causing pitting or surface etching. Always use the correct pressure settings and nozzle for concrete surfaces.

While not always necessary, sealing concrete after pressure washing helps protect it from future stains, water damage, and surface wear, prolonging its lifespan.

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Ted Dryce

Ted Dryce

Content Writer

Ted is an SEO Content Writer who has been with Groundworks since 2021. He’s covered home repair topics ranging from crawl space encapsulation to regional soil conditions. When he’s not working, Ted is performing improv comedy and working on his own creative projects.

Disclaimer: “Concrete leveling” means the process by which cracked, uneven concrete is stabilized, and in many cases lifted, by means of PolyRenewal™ polyurethane foam. Groundworks does not guarantee that PolyRenewal™ can make your concrete perfectly level.