Granite countertops are a popular and beautiful choice for kitchens and bathrooms. The durable and natural stone adds a touch of elegance to any space. However, like any surface, granite countertops can get dirty and require regular cleaning.

Many people wonder if it is safe to use a pressure washer to clean their granite countertops. While pressure washers can be a powerful tool for cleaning outdoor surfaces, they may not be the best choice for granite. Granite is a relatively porous stone, and the force of the water from a pressure washer can cause damage.

Using a pressure washer on granite countertops can lead to several problems. The high-pressure water can strip away the protective sealant on the granite, leaving it vulnerable to stains and damage. The force of the water can also cause small cracks or chips in the granite, ruining its smooth surface. Additionally, the water can seep into the pores of the granite, causing it to become discolored or even develop mold and mildew.

Instead of using a pressure washer, it is recommended to clean granite countertops with a mild soap or stone cleaner and a soft cloth or sponge. Avoid using abrasive cleaners or scrub brushes, as they can scratch the surface of the granite. After cleaning, be sure to dry the countertops thoroughly to prevent water spots or streaks.

Can Pressure Washing Harm Granite Surfaces?

Granite surfaces are known for their durability and ability to withstand various types of damage. However, it is important to exercise caution when pressure washing granite, as improper techniques can potentially harm the surface and cause long-term damage.

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One of the main concerns when pressure washing granite surfaces is the force of the water. High-pressure water can chip, crack, or etch the surface of the granite if used incorrectly. It is crucial to adjust the pressure settings to a lower level and avoid using a narrow nozzle that concentrates the water flow.

Another factor to consider is the temperature of the water. Extremely hot water can weaken the sealant on the granite and potentially cause it to fade or discolor. It is recommended to use lukewarm or cool water to minimize the risk of damaging the granite surface.

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Additional Risks to Granite Surfaces:

  • Chemical damage: Some pressure washing detergents or cleaning solutions contain harsh chemicals that can stain or damage the granite. It is important to use a mild, pH-neutral cleaner specifically designed for granite surfaces.
  • Sealant erosion: Excessive pressure or incorrect technique can strip away the protective sealant on granite surfaces. This can lead to increased susceptibility to stains, scratches, and other types of damage.
  • Surface erosion: If pressure washing is done too frequently or too aggressively, it can wear down the surface of the granite over time. This can result in a dull or uneven appearance and compromise the longevity of the granite.

To safely pressure wash granite surfaces, it is advisable to follow these guidelines:

  1. Test an inconspicuous area first to make sure the pressure and cleaning solution will not cause any damage.
  2. Use a wide-angle nozzle to distribute the pressure over a larger area and minimize the risk of concentrated force.
  3. Keep the pressure setting on the lower end and gradually increase if necessary, while monitoring the effect on the granite surface.
  4. Use a mild detergent or cleaner specifically formulated for granite surfaces, following the instructions provided.
  5. Rinse the granite thoroughly after pressure washing to remove any residue or cleaning solution.

Overall, pressure washing can be a safe and effective method for cleaning granite surfaces when done properly. However, it is essential to take the necessary precautions and avoid excessive force or harmful cleaning agents to preserve the beauty and integrity of the granite.

The Benefits of Pressure Washing Granite

Pressure washing is a powerful cleaning method that can effectively remove dirt, grime, and even tough stains from granite surfaces. Here are some benefits of pressure washing granite:

1. Deep Cleaning: Pressure washing has the ability to penetrate the porous surface of granite and remove deep-seated dirt and debris. This ensures a thorough and effective clean that can revive the appearance of your granite surfaces.

2. Time-Saving: Pressure washing is a quick and efficient cleaning solution for granite. It can cover large areas in a shorter period of time compared to manual scrubbing or traditional cleaning methods. This saves you valuable time and effort.

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3. Environmentally-Friendly: Pressure washing granite does not require the use of harsh chemicals. The high-pressure water is often enough to break down and remove stains and dirt. This makes pressure washing an environmentally-friendly option for cleaning granite surfaces.

4. Prevents Damage: Pressure washing granite surfaces can help prevent the buildup of dirt, algae, and mildew, which can contribute to the deterioration of the granite over time. By regularly pressure washing, you can extend the lifespan of your granite surfaces.

5. Restores Appearance: Over time, granite surfaces can become dull and discolored due to exposure to the elements. Pressure washing can effectively remove these surface stains and restore the original appearance of the granite, giving it a fresh and polished look.

It is important to note that while pressure washing is generally safe for granite, it is important to adjust the pressure and use appropriate attachments to prevent any damage to the surface. It is recommended to consult with a professional or test a small, inconspicuous area before pressure washing your entire granite surface.

The Potential Risks of Pressure Washing Granite

While pressure washing can be an effective method for cleaning certain outdoor surfaces, it is not recommended for granite. Granite is a porous natural stone that can be easily damaged by high-pressure water and abrasive materials.

1. Erosion of the Surface: The force of the pressure washer can cause the surface of the granite to erode, leading to a loss of shine and smoothness. Over time, this can make the granite look dull and worn-out.

2. Cracking and Chipping: Granite countertops or tiles can develop cracks or chips when exposed to the high-pressure water stream. This is especially true if the granite has existing weak spots or fractures.

3. Damage to the Sealing: Most granite surfaces are sealed to prevent stains and damage. Pressure washing can strip off the protective sealant, making the granite vulnerable to stains, etching, and other forms of damage.

4. Discoloration and Streaking: Pressure washing can sometimes cause granite to become discolored or streaked. This may happen if the water used contains chemicals or if the pressure washer is not used correctly.

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Alternatives to Pressure Washing Granite

If you need to clean granite surfaces, it is best to avoid pressure washing and opt for gentle methods instead. Here are some alternatives:

  • Use a soft cloth or sponge with mild soap and warm water to wipe the granite surface.
  • For tougher stains, make a paste of baking soda and water, apply it to the stain, and gently scrub with a soft brush.
  • Regularly use a granite-specific cleaner that is safe for your specific type of granite. Follow the manufacturer’s instructions for best results.

Remember to always test any cleaning product on a small, inconspicuous area of the granite before using it on larger parts of the surface.


In summary, pressure washing is not suitable for granite surfaces due to the potential risks of surface erosion, cracking, damage to the sealing, and discoloration. It is best to use gentle cleaning methods specifically designed for granite to maintain its beauty and longevity.

Questions and answers

Can you pressure wash granite countertops?

Yes, you can pressure wash granite countertops. However, it is important to use the right pressure and detergent to avoid damaging the granite surface.

What is the proper pressure setting for pressure washing granite?

The proper pressure setting for pressure washing granite is around 1,000-1,200 PSI. This is enough to clean the surface without causing any damage.

Can I use any detergent to pressure wash granite?

No, you should not use any detergent to pressure wash granite. It is recommended to use a gentle, pH-neutral cleaner specifically designed for granite surfaces.

Are there any precautions I need to take when pressure washing granite?

Yes, there are a few precautions you need to take when pressure washing granite. First, make sure to test the pressure washer on a small, inconspicuous area of the granite to ensure that it doesn’t cause any damage. Second, avoid using excessive pressure or holding the pressure washer nozzle too close to the surface. Finally, always follow the manufacturer’s instructions for your pressure washer and any cleaning products you use.