If you have aggregate concrete surfaces, such as driveways, patios, or sidewalks, you may be familiar with the struggle of keeping them clean. Over time, dirt, grime, and stains can build up, making your once beautiful surfaces look dull and unkempt. Regular maintenance is essential to prevent the deterioration of aggregate concrete.

One effective way to clean and restore the look of your aggregate concrete is by pressure washing. Pressure washing uses a high-powered stream of water to remove even the toughest stains and grime from the surface. However, it’s important to use the right techniques and equipment to avoid damaging the concrete.

Before you begin pressure washing, it’s crucial to prepare the area. Remove any loose debris, such as leaves or branches, and sweep the surface to ensure it’s free from loose dirt. If there are any oil or grease stains, apply a degreaser and let it sit for a few minutes before rinsing it off. Taking these steps will ensure that the pressure washer can effectively clean the surface.

What is Aggregate Concrete?

Aggregate concrete, also known as exposed aggregate or decorative concrete, is a type of concrete that is designed to have a more natural and visually appealing finish. It is made up of a combination of cement, water, and various types of aggregates, such as crushed stone, gravel, sand, or recycled materials like glass or seashells.

When the concrete mix is poured and then cured, the top layer is removed to expose the aggregates embedded within. This creates a textured, pebble-like surface with a range of colors and sizes, depending on the type of aggregates used. Aggregate concrete is commonly used for driveways, patios, walkways, and other outdoor surfaces.

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One of the key benefits of aggregate concrete is its durability. The aggregates provide strength and resistance to wear and tear, making it ideal for high-traffic areas. Additionally, the exposed surface is less prone to cracking and can withstand extreme weather conditions.

Another advantage of aggregate concrete is its aesthetic appeal. The variety of colors and textures available with different aggregates allows for endless design possibilities. From traditional gray or tan tones to vibrant blues or reds, aggregate concrete can enhance the overall look and feel of any outdoor space.

Maintaining aggregate concrete requires regular cleaning to remove dirt, grime, and stains. Pressure washing is an effective method to restore the appearance of aggregate concrete surfaces, as it can remove deep-seated dirt and bring out the natural beauty of the aggregates.

  • Benefits of aggregate concrete:
  • Durability and resistance to wear and tear
  • Wide range of colors and textures
  • Enhances the aesthetic appeal of outdoor spaces
  • Can withstand extreme weather conditions

Overall, aggregate concrete offers both functional and aesthetic benefits, making it a popular choice for various outdoor applications. Regular pressure washing can help maintain its appearance and prolong its lifespan.

Benefits of Pressure Washing

Pressure washing is a highly effective method for cleaning and maintaining aggregate concrete surfaces. Here are some of the key benefits:

1. Removes Tough Stains: Pressure washing can effectively remove tough stains, such as oil, grease, algae, moss, and mildew, from aggregate concrete. The high pressure and water flow can penetrate deep into the surface, eliminating stubborn stains and restoring the concrete’s original appearance.
2. Enhances Curb Appeal: Regular pressure washing can significantly enhance the curb appeal of your aggregate concrete surfaces. By removing dirt, grime, and stains, pressure washing can make your driveways, walkways, and patios look clean and well-maintained, improving the overall appearance of your property.
3. Prevents Damage: Over time, dirt, debris, and organic growth can build up on aggregate concrete surfaces and cause damage. Pressure washing can help prevent this damage by removing these harmful substances, which can cause cracks, erosion, and discoloration.
4. Saves Time and Effort: Compared to manual cleaning methods, pressure washing is much faster and requires less effort. The high-pressure water stream can cover large areas quickly, making the cleaning process more efficient and less time-consuming.
5. Cost-Effective: Investing in a pressure washer or hiring a professional pressure washing service can save you money in the long run. Regular pressure washing can help prolong the lifespan of your aggregate concrete surfaces, reducing the need for costly repairs or replacements.
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Overall, pressure washing is a convenient, effective, and cost-efficient way to clean and maintain aggregate concrete surfaces. It can help improve the appearance of your property, prevent damage, and save you time and money in the process.


Before you begin pressure washing aggregate concrete, it is important to properly prepare the area to ensure the best results. Follow these steps to prepare the surface:

Clean the area

Start by removing any furniture, plants, or other objects from the area you plan to pressure wash. Sweep the surface to remove loose debris such as leaves, dirt, and rocks. For better results, use a broom with firm bristles to loosen any stubborn dirt.

Apply a detergent

To achieve a deep clean, it is recommended to apply a detergent specifically designed for pressure washing aggregate concrete. These detergents help break down grease, oil, and grime, making it easier to remove them with the pressure washer.

Follow the manufacturer’s instructions to mix the detergent with water in the appropriate ratios. Use a garden sprayer or a watering can to evenly apply the detergent over the surface. Allow the detergent to penetrate the stains for the recommended amount of time.

Note: Avoid using harsh chemicals or bleach as they can damage the aggregate concrete surface.

Tip: For tough stains or high-traffic areas, you may need to scrub the surface with a stiff brush or broom before applying the detergent.

Gather the Necessary Equipment

Before you start pressure washing your aggregate concrete, you will need to gather the necessary equipment. Make sure you have the following items on hand:

  • Pressure washer: Look for a pressure washer that has a psi (pounds per square inch) rating between 2,000 and 3,000. This will provide enough power to effectively clean the concrete.
  • Nozzle: Choose a nozzle with a wide spray pattern to cover larger areas of the concrete more efficiently. A 25-degree nozzle is a good option for most aggregate concrete surfaces.
  • Hose: Connect the hose to your pressure washer and make sure it is long enough to reach all areas of the concrete surface you want to clean.
  • Cleaning solution: Use a specially formulated cleaner for concrete surfaces, or a mixture of water and mild detergent.
  • Protective gear: Wear safety goggles to protect your eyes from debris and chemicals, as well as gloves and closed-toe shoes.
  • Broom or brush: Use a broom or brush to remove any loose dirt, leaves, or debris from the surface before pressure washing.
  • Tarp or plastic sheeting: If there are nearby plants or objects that you want to protect from overspray or cleaning solutions, cover them with a tarp or plastic sheeting.

By gathering all the necessary equipment, you will be well-prepared to start pressure washing your aggregate concrete and achieve the best results.

Clear the Area

Before you start pressure washing the aggregate concrete, it is important to clear the area of any items or obstructions that may be in the way. This includes any furniture, plants, or other objects that are on or near the concrete surface. Moving these items will prevent any damage to them and ensure that the entire surface can be cleaned effectively.

Additionally, it is a good idea to sweep the area with a broom to remove any loose debris such as leaves, dirt, or small rocks. This will help to prevent the pressure washer from pushing these materials into the concrete or causing additional damage.

If there are any oil stains or other stubborn stains on the concrete, it may be necessary to treat them with a stain remover prior to pressure washing. This will help to loosen and lift the stain, making it easier to remove during the cleaning process.

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By taking the time to clear the area and prepare the surface, you can ensure that your pressure washing job will be more effective and efficient, leaving your aggregate concrete looking clean and refreshed.

Pressure Washing Technique

When pressure washing aggregate concrete, it is important to use the right technique to ensure thorough cleaning without causing any damage. Here are the steps to follow:

1. Prepare the area

Before starting the pressure washing process, remove any furniture, vehicles, or other objects from the concrete surface. Sweep the area to remove loose debris and dirt.

2. Apply a detergent solution

Mix a suitable concrete cleaner or detergent with water according to the manufacturer’s instructions. Apply the solution to the concrete surface and let it sit for a few minutes to penetrate and loosen any stubborn stains or grime.

3. Select the right pressure washer

Choose a pressure washer with a suitable pressure setting for aggregate concrete. It is recommended to use a pressure washer with a psi of at least 3000 to effectively clean the surface. Make sure the nozzle is set to a wide spray pattern to cover a larger area.

4. Start pressure washing

Hold the pressure washer wand at a 45-degree angle to the concrete surface and maintain a consistent distance of about 12 to 18 inches. Begin pressure washing the surface using slow and even strokes, working from one end to the other. Pay special attention to any stained or heavily soiled areas.

5. Rinse thoroughly

After pressure washing the entire surface, thoroughly rinse off the detergent solution and any loosened dirt or grime. Start from the highest point and work your way down to prevent streaks and ensure complete cleaning.

Remember to wear protective clothing, such as gloves and safety goggles, when pressure washing. Also, be mindful of nearby plants or fragile objects that may be affected by the high pressure.

By following these pressure washing techniques, you can effectively clean aggregate concrete without causing any damage, leaving your surface looking fresh and renewed.

Select the Right Nozzle

When pressure washing aggregate concrete, it’s crucial to select the right nozzle for the job. The nozzle you choose will determine the pressure and flow of water, as well as the spray pattern. Using the wrong nozzle can result in damage to your concrete surface and even personal injury.

There are various types of nozzles available, each with its own specific purpose. The most common types include:

  • 0-degree nozzle: This nozzle produces a concentrated, high-pressure stream of water. It’s best suited for tough stains or stubborn dirt, but should be used with caution as it can cause damage to the concrete surface.
  • 15-degree nozzle: This nozzle produces a narrow spray pattern that combines high pressure with increased coverage. It’s ideal for general cleaning purposes and removing dirt and grime.
  • 25-degree nozzle: This nozzle creates a wider spray pattern, making it suitable for larger areas. It provides a good balance between pressure and coverage, making it an excellent choice for aggregate concrete surfaces.
  • 40-degree nozzle: This nozzle produces a wider, gentler spray pattern that is ideal for rinsing and light cleaning tasks. It’s less likely to cause damage to the concrete surface compared to the narrower nozzles.

Before starting your pressure washing project, it’s important to assess the condition of your aggregate concrete and determine the level of cleaning required. This will help you choose the right nozzle and ensure optimal results.

Remember to always wear protective gear, such as safety goggles and gloves, when using a pressure washer. Additionally, test the selected nozzle in a small, inconspicuous area of the concrete surface before proceeding to clean the entire area. This will allow you to observe the effect of the pressure and ensure that no damage occurs.

By selecting the right nozzle for your pressure washing job, you can effectively clean and restore your aggregate concrete without causing any harm.

Start with a Low Pressure

When pressure washing aggregate concrete, it’s important to start with a low pressure setting to avoid damaging the surface. Using a pressure washer with too high of a pressure can cause the aggregate to loosen or chip, resulting in an uneven appearance.

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Before you begin, adjust the pressure washer to a low setting and test it on a small, inconspicuous area of the concrete. This will allow you to gauge the impact of the pressure and make any necessary adjustments before moving on to the larger areas.

Protecting Nearby Plants and Surfaces

Aggregate concrete surfaces are often found in outdoor areas with surrounding plants and surfaces that can be sensitive to high pressure. To protect these areas, consider covering nearby plants with plastic sheeting or using a tarp to shield them from the potential spray. Additionally, be mindful of any nearby surfaces, such as windows or vehicles, that may be susceptible to damage from the pressure washer. Taking these precautions will help prevent any unnecessary damage during the pressure washing process.

Using the Right Nozzle

When pressure washing aggregate concrete, it’s important to use the right nozzle to control the spray pattern and pressure. A wide-angle nozzle, such as a 25-degree tip, is recommended for aggregate surfaces. This nozzle will provide a broader spray pattern, distributing the pressure more evenly and reducing the risk of damage to the surface.

It’s also important to maintain a consistent distance between the nozzle and the surface. Typically, a distance of eight to twelve inches is optimal for pressure washing aggregate concrete. This allows the water to effectively clean the surface without causing any harm. Adjust the distance as needed, keeping in mind that too close of a distance can cause damage, while too far of a distance may not provide sufficient cleaning power.

Tip: Always follow the manufacturer’s instructions for your specific pressure washer model and consult with a professional if you have any concerns or questions.

Questions and answers,

What is aggregate concrete?

Aggregate concrete is a type of concrete that contains a mixture of various sizes of stones or gravel. These larger particles are called aggregates, and they are mixed with cement and water to form the concrete mixture. Aggregate concrete is commonly used for driveways, patios, and sidewalks due to its durability and strength.

Why should I pressure wash aggregate concrete?

Pressure washing aggregate concrete is important to maintain its appearance and longevity. Over time, dirt, grime, and other debris can accumulate on the surface of the concrete, making it look dull and dirty. Pressure washing can help remove these contaminants, restoring the original look of the concrete and preventing potential damage.

Can I pressure wash aggregate concrete myself?

Yes, pressure washing aggregate concrete is a task that can be done by homeowners. However, it is important to use the right equipment and techniques to avoid damaging the surface of the concrete. Make sure to use a pressure washer with the appropriate pressure setting and a wide-angle nozzle. It is also recommended to apply a suitable detergent to help loosen dirt and stains before pressure washing.

Are there any precautions I should take when pressure washing aggregate concrete?

Yes, there are a few precautions to keep in mind when pressure washing aggregate concrete. First, avoid using excessive pressure, as it can cause the aggregate particles to dislodge or damage the concrete surface. It is also important to wear protective gear, such as goggles and gloves, to protect yourself from flying debris and chemical cleaners. Additionally, be mindful of nearby plants and surfaces that could be affected by the pressure washing process.

Can pressure washing remove stubborn stains from aggregate concrete?

Pressure washing can be effective in removing some stubborn stains from aggregate concrete, but it may not completely eliminate all types of stains. For tough stains like oil or grease, it is recommended to use a specialized concrete cleaner or degreaser before pressure washing. Scrubbing the stained area with a brush or broom can also help break down the stains before pressure washing.