Flagstone adds natural charm and timeless beauty to the patios, walkways, and outdoor spaces but without proper care, it can lose its luster over time. If you want to know how to clean flagstone easily and keep it looking beautiful for long years, then you’re in the right place.

In this blog guide, we will discuss how to clean flagstone. We are going to  walk you through everything you need to know about the best ways to clean flagstone and seal it for long lasting protection. From removing dirt and tough stains to applying the right sealant, these techniques will help you maintain the elegance and durability of your stone surfaces.

Preparing Flagstone for Cleaning

Before you start cleaning your flagstone, it is important to prepare the surface properly. A well-prepped area ensures a more effective and efficient cleaning process.

How will be get started:

1. Clear the Area: Remove furniture, planters, and décor to give yourself unobstructed access.
   
2. Sweep Away Debris: Use a broom or leaf blower to remove loose dirt, leaves, and twigs.
   
3. Wet the Surface: Lightly wet your flagstone with clean water to loosen grime and prevent damage from concentrated cleaners.
   
4. Test Cleaning Solutions: Always test your cleaning product on a small, hidden area to ensure it won’t discolor the stone.
   
5. Protect Surroundings: Use plastic sheeting or painter’s tape to shield nearby plants, walls, or fixtures from splashes.
   

Once you’ve prepared the surface, you’re ready to begin cleaning your flagstone effectively.

Removing Dirt and Debris

The first step in cleaning flagstone is removing built-up dirt and surface grime. Regular cleaning keeps the stone looking vibrant and prevents long-term damage.

Follow these simple steps:

• Use a Soft Bristle Brush: Gently scrub the flagstone to loosen dirt from cracks and crevices.
  
• Apply a Mild Cleaning Solution: Mix a gentle cleaner with water and apply it to the stone. Avoid harsh chemicals.
  
• Scrub Gently: Move in circular motions to lift dirt without scratching the surface.
  
• Rinse Thoroughly: Use a hose or low-pressure washer to rinse off the cleaning solution.
  
• Repeat if Needed: For heavily soiled areas, repeat the process until your flagstone is clean and restored.
  

Eliminating Tough Stains on Flagstone

Flagstone can develop stubborn stains from oil, rust, moss, or mildew. Address these promptly to restore your stone’s natural beauty.

• Oil Stains: Blot excess oil, then apply a paste made of baking soda and water. Let it sit for several hours, then rinse and scrub gently.
  
• Rust Stains: Sprinkle powdered oxalic acid on the dampened area, scrub with a brush, and rinse thoroughly after 15 minutes.
  
• Moss & Mildew: Mix equal parts water and white vinegar in a spray bottle. Apply it to the affected area, wait 15 minutes, scrub lightly, and rinse clean.
  

💡 Pro Tip: Regular flagstone cleaning and prompt stain removal prevent deep discoloration and damage.

Proven Methods for Cleaning Flagstone

To maintain your flagstone’s natural beauty, clean it regularly using one of these effective techniques:

• Sweeping: Remove debris before deeper cleaning to prevent scratching.
  
• Vinegar Solution: Mix equal parts water and vinegar for a gentle, eco-friendly cleaner. Rinse thoroughly afterward.
  
• Pressure Washing: For large or heavily soiled areas, use a pressure washer on a low setting (1000–1500 psi) and keep the nozzle at least 12 inches away from the surface.
  
• Avoid Harsh Chemicals: Never use bleach, ammonia, or acidic cleaners—they can damage the stone’s surface.
  

Once cleaned, sealing your flagstone will protect it from future damage.

Using Mild Soap Solutions for Flagstone Cleaning

When deciding how to clean flagstone, mild soap solutions are a safe and effective option. Mix warm water with a few drops of dish soap or a pH-neutral stone cleaner.

To clean:

1. Sweep the flagstone to remove loose dirt.
2. Scrub gently with a soft brush dipped in the soapy solution.
3. Rinse thoroughly with clean water to remove all residue.
   

Always test any solution on a small area first to ensure it doesn’t alter your flagstone’s color or texture.

Pressure Washing Flagstone Safely

Pressure washing can be effective for deep flagstone cleaning, but it must be done carefully to avoid damaging the stone.

Best practices:

• Use a low to medium pressure (1500–2000 psi).
• Select a wide-angle nozzle to distribute water evenly.
  =
• Maintain a 12–18 inch distance between the nozzle and the surface.
  
• Test a small area first before cleaning the entire surface.
  

When used properly, pressure washing can remove stubborn dirt and restore the natural look of your flagstone.

Selecting and Applying the Right Flagstone Sealant

After cleaning your flagstone, sealing is the next crucial step to protect it from moisture, stains, and UV damage.

Choosing the best sealant:

• Select a penetrating sealant for porous flagstone or a surface sealant for denser types.
• Choose between a matte or glossy finish depending on your desired look.
• Opt for products that provide UV, water, and stain resistance.
  

Application tips:

1. Clean and dry the flagstone completely.
2. Apply the sealant evenly using a brush or roller.
3. Work in sections to ensure full coverage, including joints and crevices.
4. Allow the sealant to dry completely before applying a second coat if needed.
   

Post-Sealing Maintenance: Keeping Your Flagstone Beautiful

After sealing, regular maintenance ensures long-lasting results:

• Sweep or rinse regularly to prevent buildup of dirt and debris.
• Use mild, pH-neutral cleaners for periodic washing.
• Avoid abrasive tools and harsh chemicals that can strip the sealant.
• Inspect your flagstone annually and reapply sealant as needed for continued protection.
  

By following these flagstone cleaning and sealing techniques, you’ll preserve your stone’s natural charm and strength for years to come.

Conclusion

Learning how to clean flagstone properly is key to keeping your outdoor spaces beautiful and protected. With regular care, the right cleaning solutions, and professional-quality sealants like TSS Pro Sealants, you can ensure your flagstone stays vibrant, resilient, and easy to maintain for decades.