How to clean outdoor granite tiles

Here is a clear guide on how to clean outdoor granite tiles, covering routine cleaning and dealing with tougher stains.

Regular/Routine Cleaning

For general dirt, dust, pollen, and light stains, follow these simple steps:

1. Sweep or Dry Mop: First, remove loose debris, leaves, and dirt with a soft broom or a dry dust mop.

2. Prepare a Mild Cleaning Solution:

• Use a pH-neutral stone cleaner (best option) or a few drops of mild dish soap in a bucket of warm water.
• Avoid: Harsh cleaners like bleach, ammonia, vinegar, lemon juice, or generic bathroom/grout cleaners. These acidic or alkaline chemicals can degrade the protective sealer and etch the stone surface over time.

3. Scrub Gently:

Use a soft-bristle brush (nylon brush or push broom) or a non-abrasive microfiber mop.

Scrub the tiles with the soapy solution to lift dirt from the textured surface.

4. Rinse Thoroughly:

This is a crucial step. Use a garden hose to rinse off all the soapy residue completely. Leftover soap can leave a dulling film and attract more dirt.

5. Dry (Optional but Beneficial):

Allow the granite to air dry. For a streak-free shine on honed or polished granite, you can towel dry it.

Dealing with Specific Stains & Deep Cleaning

For oil, grease, rust, or persistent organic stains (mold, mildew, algae):

1. For Organic Stains (Mold, Mildew, Algae):

• Mix a solution of 12% hydrogen peroxide with a few drops of ammonia (wear gloves).
• Apply it to the stained area, cover with plastic wrap, and let it sit for several hours or overnight. Rinse thoroughly.

2. For Oil or Grease Stains:

1. Create a poultice: This is a paste that draws the stain out.
2. Mix a poultice powder (like diatomaceous earth) with a poultice liquid (acetone or a specialized stain remover for oil) to form a thick paste.
3. Apply the paste over the stain, about ¼-inch thick, extending past the stain's edges.
4. Cover with plastic wrap and tape down the edges. Let it dry completely (24-48 hours).
5. Remove the plastic, let the poultice powder crumble away, and rinse the area.

3. For Rust Stains:

• Use a commercial rust remover poultice specifically designed for stone. Follow the product instructions carefully.
• Important Note for Stains: Always test any cleaning product or poultice in an inconspicuous area first to ensure it doesn't discolor or damage your granite.

What to AVOID

• Acidic Cleaners (vinegar, lemon, many bathroom cleaners): Can etch the surface.
• Abrasive Pads or Powders: Can scratch the surface, especially polished granite.
• High-Pressure Power Washers: The intense pressure can force water underneath tiles, compromise the sealer, and in rare cases, damage the stone's surface if too close. Use a garden hose sprayer instead.
• De-icing Chemicals: In winter, avoid salt or chemical ice melters, as they can cause spalling (surface pitting). Use sand or kitty litter for traction.

Key to Easy Cleaning: Proper Sealing

• A quality penetrating sealer is your best defense. It makes the granite highly stain-resistant and much easier to clean.
• Test if Sealing is Needed: Sprinkle a few drops of water on the tile. If it darkens quickly (within 1-2 minutes) and soaks in, it's time to re-seal. If it beads up, the seal is still effective.
• Re-seal your outdoor granite tiles every 1 to 3 years, depending on climate and wear.

Quick Summary Checklist

1. Sweep regularly.
2. Wash with mild soap & water.
3. Rinse thoroughly.
4. Blot spills immediately.
5. Use a poultice for tough stains.
6. Re-seal periodically.
7. AVOID acids, abrasives, and pressure washers.

Following these steps will keep your outdoor granite tiles looking beautiful and extend their lifespan for decades.