Granite paving should normally be cleaned using the least aggressive effective method. Begin with sweeping, clean water and a stiff outdoor brush. If further treatment is required, use a mild pH-neutral or purpose-designed natural-stone cleaner suitable for the particular stain. Avoid brick acid, concentrated acidic products and untested household chemicals.
Although granite paving slabs are dense and hard-wearing, their textured outdoor surfaces can still collect soil, algae, leaves, oil, food, rust and installation residue. Correct cleaning protects the stone, the joints and the surrounding garden.
Quick Answer: How Do You Clean Granite Paving?
- Sweep away all loose soil, leaves and grit.
- Wet the paving with clean water.
- Apply a mild stone-safe cleaner if water alone is insufficient.
- Brush the surface using a stiff non-metallic outdoor brush.
- Allow specialist cleaners to work only for the stated time.
- Rinse thoroughly with clean water.
- Inspect the paving after it dries before repeating treatment.
Do not begin with the strongest available chemical. Identify the stain first and test the proposed cleaner on a spare slab or discreet area.
What Equipment Do You Need?
Basic granite paving cleaning normally requires:
- A stiff outdoor broom.
- A non-metallic scrubbing brush.
- Clean water.
- A bucket or low-pressure hose.
- A mild pH-neutral or stone-safe detergent.
- Gloves and eye protection where required.
- Absorbent paper, cloth or granules for oil spills.
- A suitable specialist cleaner for identified stains.
Avoid wire brushes that may leave metal contamination or scratch surrounding materials. Always follow the safety instructions supplied with chemical cleaners.
Routine Cleaning for Granite Paving
Regular sweeping is the simplest and safest cleaning method. Remove leaves, soil, compost, berries, flower petals and other organic matter before they decay or remain trapped on a damp surface.
For general dirt:
- Sweep the paving thoroughly.
- Rinse it with clean water.
- Apply a small quantity of mild stone-safe detergent if required.
- Brush the textured surface in more than one direction.
- Rinse until no detergent residue remains.
Repeated use of excessive detergent may leave a film that attracts dirt or alters the appearance of the surface. Use only the amount required.
Can You Pressure Wash Granite Paving?
Yes. Granite paving can normally be pressure washed, but the pressure washer must be used to clean the surface rather than attack the joints.
Use a wide fan spray and keep the lance moving. Maintain a sensible distance and approach the surface at an angle rather than pointing a concentrated jet straight down.
Avoid:
- Turbo nozzles.
- Zero-degree jets.
- Holding the nozzle close to one point.
- Directing high pressure into the joints.
- Pressure washing loose or already damaged paving.
After cleaning, inspect the joints. Replace any jointing material disturbed by the water pressure.
How to Remove Algae and Green Growth
Algae commonly develops in shaded, damp and slow-drying areas. Its presence does not necessarily indicate a fault in the granite.
For light algae:
- Sweep away loose material.
- Wet and brush the affected area.
- Rinse with clean water.
For persistent algae, use a purpose-designed algae remover confirmed as suitable for natural stone paving. Follow the stated coverage, dwell time and rinsing instructions.
Cleaning removes the growth but may not remove its cause. Restricted sunlight, poor airflow, blocked drainage, overhanging vegetation and standing water can encourage algae to return.
How to Remove Moss and Lichen
Remove thick moss carefully with a plastic scraper or stiff brush before applying a suitable cleaner. This allows the treatment to reach the paving surface more effectively.
Lichen can be more difficult because it attaches firmly to textured stone. A purpose-designed natural-stone treatment may require more than one application. Do not attempt to burn, aggressively grind or chisel growth from the paving.
How to Remove Oil and Grease
Oil, barbecue grease and vehicle fluids should be treated quickly.
- Blot the spill rather than wiping it across the paving.
- Use absorbent paper, cloth or suitable granules to remove excess liquid.
- Apply a stone-safe degreaser following its instructions.
- Rinse the area thoroughly.
- Repeat the treatment if the stain has penetrated the stone.
Older or deeper oil stains may require a poultice treatment or professional cleaning. Do not mix several chemical products in an attempt to accelerate removal.
How to Remove Food, Drink and Barbecue Stains
Food, wine, tea, coffee, sugary drinks and barbecue residue should be removed promptly. Begin with warm water and a mild stone-safe detergent.
For oily food marks, use a compatible degreasing cleaner. For coloured organic stains, use a product specifically intended for natural stone rather than applying bleach or acid without confirming suitability.
How to Remove Rust Marks
Rust marks may come from metal furniture, plant stands, tools, fire pits, barbecue legs, fertiliser or contamination during handling and cutting.
Remove the source first. Then use a rust remover specifically confirmed as suitable for granite or natural stone paving. Test a small area before treating the complete mark.
Some orange, brown or metallic-looking marks may originate within the stone rather than from an external metal object. These require correct diagnosis before treatment. See our separate granite paving rust marks and mineral veins guide.
How to Remove Plant Pot and Fertiliser Marks
Plant pots can trap moisture, soil and fertiliser against the paving. Move pots regularly and use pot feet to improve airflow and drainage.
Begin by washing circular pot marks with water and a mild stone-safe cleaner. Fertiliser products may contain iron and other minerals capable of causing persistent staining, so identify the product before selecting a specialist treatment.
How to Remove Cement, Mortar and Jointing Residue
Cement haze, mortar spots and jointing residue should be prevented during installation wherever possible. Fresh residue is generally easier to remove than material that has fully hardened.
Do not automatically use brick acid. Acid may affect jointing, surrounding materials, sealers and some minerals within natural stone. Use a residue remover specifically approved for the paving and jointing system, and test it before wider application.
Thick hardened mortar should not be aggressively chipped from the slab without considering the risk of damaging the textured surface. Significant contamination may require specialist advice.
How to Remove Paint, Graffiti and Chewing Gum
Fresh paint should be blotted and contained rather than spread across the paving. The correct removal method depends on whether the paint is water-based, oil-based or chemically cured.
Dried paint, graffiti and hardened chewing gum may require a specialist remover or professional treatment. Test all solvents and cleaning products first, and prevent contaminated run-off from entering drains or planting areas.
Can You Use Bleach on Granite Paving?
Bleach should not be the default cleaner for granite paving. It may affect plants, lawns, coloured jointing, surrounding materials and existing surface treatments.
A purpose-designed stone or paving cleaner is normally a more controlled option. If any bleach-based product is being considered, confirm its suitability, follow the dilution instructions and protect surrounding areas.
Can You Use Brick Acid on Granite Paving?
Brick acid should not be used as a general granite paving cleaner. Granite is not one uniform material, and acid may affect mineral components, joints, sealers and adjacent surfaces.
Use a cleaner designed for the specific contamination and confirmed as compatible with granite and the installed jointing system. Always carry out a test before wider use.
Cleaning Newly Installed Granite Paving
New paving may carry dust, cutting residue, packaging marks or installation contamination. Remove residue as work progresses rather than waiting until the entire patio has cured.
Before cleaning newly installed paving:
- Confirm that the bedding and jointing materials have cured.
- Identify the exact contamination.
- Check the cleaner against both the granite and jointing product.
- Test a spare slab or discreet area.
- Prevent dirty run-off from drying on adjacent paving.
Do not pressure wash uncured or recently installed joints.
Should Granite Be Sealed After Cleaning?
Granite paving does not always need sealing. If additional stain protection is required, allow the paving to dry fully before applying a compatible breathable impregnating sealer.
Do not seal over remaining dirt, moisture, algae or chemical residue. For wider guidance on sealing, joints, drainage and seasonal inspections, see our granite paving maintenance guide.
Cleaning Mistakes to Avoid
- Using brick acid as a general-purpose cleaner.
- Mixing different cleaning chemicals.
- Applying strong chemicals without testing.
- Allowing cleaners to dry on the paving.
- Using a wire brush that may leave metal contamination.
- Spreading oil instead of blotting it.
- Using a turbo pressure-washer nozzle.
- Directing high pressure into the joints.
- Sealing paving before it is clean and dry.
- Ignoring the source of recurring algae or rust.
Granite Paving Cleaning FAQs
What Is the Best Cleaner for Granite Paving?
Clean water and a stiff non-metallic brush are the safest starting point. For general dirt, use a mild pH-neutral or purpose-designed natural-stone cleaner. Specialist stains require compatible specialist products.
Can Granite Paving Be Jet Washed?
Yes. Use a wide fan spray, keep the nozzle moving and avoid directing concentrated pressure into the joints.
How Do You Remove Green Algae from Granite?
Brush and rinse light growth. For persistent algae, use a purpose-designed treatment suitable for natural stone paving and address shade, drainage and organic debris that may cause it to return.
Can You Clean Granite Paving with Bleach?
Bleach is not normally the best first choice because it can affect plants, jointing and surrounding materials. A compatible stone or paving cleaner provides a more controlled treatment.
Can You Use Brick Acid on Granite?
Brick acid should not be used as a general granite cleaner. It may affect minerals, joints, sealers and adjacent materials. Use a cleaner designed for the identified contamination.
How Do You Remove Oil from Granite Paving?
Blot fresh oil, absorb as much as possible and apply a compatible stone-safe degreaser. Older stains may require repeated treatment or a specialist poultice.
How Often Should Granite Paving Be Cleaned?
Sweep it regularly and wash it when visible dirt develops. Most domestic patios require a deeper clean once or twice a year, while shaded or heavily used areas may need more frequent attention.
Why Does Granite Look Darker When Wet?
Water changes how light reflects from the stone and temporarily makes the colour appear darker. This is normal and does not by itself indicate damage.
Final Cleaning Advice
The safest approach is to identify the contamination and begin with the mildest effective method. Routine dirt, algae, oil, rust and cement residue are different problems and should not all be treated with the same chemical.
Good cleaning protects more than the visible granite. It also preserves the joints, nearby planting, drainage system and any existing surface treatment. When the cause of a mark is uncertain, test first or obtain specialist advice before treating a large area.
