Step-by-Step Guide: How to Clean Block Paving
Block paving can enhance the appearance of your driveway, patio or garden path, but over time it can become discoloured with moss, algae, weeds, or dirt. Regular maintenance not only keeps it looking its best but also helps extend its lifespan.
Here’s how to clean your block paving properly and safely.
Tools & Materials You'll Need
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Pressure washer or stiff brush
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Patio cleaner or mild detergent (optional)
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Bucket and water supply
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Weed removal tool or hoe
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Kiln-dried sand (for re-sanding joints)
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Stiff broom
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Protective gloves and safety goggles
Step-by-Step Guide
Step 1: Clear the Area
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Remove all furniture, planters, or ornaments from the paving.
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Pick up any loose debris like leaves, stones, or litter.
Step 2: Remove Weeds and Moss
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Pull out weeds by hand or use a weed removal tool.
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A hoe can help with deeper roots.
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For moss or algae, you may use a moss killer or patio cleaner—follow product instructions.
Tip: Do this a day or two before power washing for best results.
Step 3: Sweep the Surface Thoroughly
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Use a stiff broom to sweep away loose dirt, sand, and plant material.
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Focus on clearing debris from the joints between blocks.
Step 4: Wash the Paving
Option A: With a Pressure Washer (Recommended)
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Use a fan nozzle or rotary patio cleaner attachment to avoid damaging blocks.
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Start at the highest point and work downhill.
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Hold the lance at a shallow angle and keep the nozzle about 20–30cm from the surface.
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Use even, sweeping motions across the surface.
Option B: Without a Pressure Washer
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Mix a bucket of warm water with mild patio cleaner or washing-up liquid.
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Scrub the surface vigorously with a stiff brush, focusing on stained or dirty areas.
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Rinse with clean water from a hose.
Step 5: Allow to Dry
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Let the area dry fully—usually 24 to 48 hours depending on weather.
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Check that joints are dry before the next step.
Step 6: Re-sand the Joints
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Pour kiln-dried sand over the dry paving.
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Sweep the sand across the surface with a broom so it fills the joints completely.
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Add more sand and sweep again if necessary.
Avoid doing this on a windy or rainy day.
Step 7 (Optional): Apply a Sealant
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Once the surface is clean and dry, apply a block paving sealant to protect against future stains, weeds, and weathering.
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Follow the manufacturer’s instructions carefully.
Done! Your block paving should now look refreshed and well maintained.
10 Frequently Asked Questions About Cleaning Block Paving
1. How often should I clean block paving?
Once or twice a year is sufficient for most homes—typically in spring and autumn. Heavy use areas may need more frequent cleaning.
2. Can I use bleach to clean block paving?
You can, but it’s not generally recommended. Bleach can:
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Discolour the blocks
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Harm surrounding plants
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Create runoff pollution
Use purpose-made patio cleaners instead.
3. Will pressure washing damage the paving?
Not if done correctly. Avoid:
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Holding the nozzle too close
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Using a narrow jet
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Focusing on one spot too long
Stick to a fan nozzle or rotary attachment to reduce risk.
4. Can I remove black spots or algae from block paving?
Yes. Use an algaecide or specialist patio cleaner formulated for removing black spots. These are more effective than general cleaners or pressure washing alone.
5. What is kiln-dried sand, and why is it important?
Kiln-dried sand is very fine, dry sand that:
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Fills joints between blocks
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Helps stabilise them
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Prevents weed growth
Re-sanding after cleaning ensures paving stays firm and tidy.
6. Can I clean block paving without a pressure washer?
Yes. Scrubbing with warm water and a stiff brush works, especially when combined with a suitable patio cleaning solution. It’s more labour-intensive but gentler.
7. Should I seal block paving after cleaning?
Sealing:
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Reduces staining and weed growth
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Enhances colour
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Protects against frost damage
It’s optional but useful for long-term maintenance. Reapply every 3–5 years.
8. Why are the joints between my blocks eroding?
Usually caused by:
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Pressure washing too closely
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Lack of re-sanding
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Poor initial installation
Refill with kiln-dried sand regularly to maintain joint stability.
9. How do I remove oil stains from block paving?
Use an oil stain remover specifically made for paving. Apply, leave to absorb (per instructions), and rinse thoroughly.
10. Can I use washing-up liquid to clean block paving?
Yes, it’s a mild alternative for general dirt, though it’s not powerful enough for heavy staining, algae, or black spots.
Printable Checklist: Cleaning Block Paving
Use this checklist to keep your paving clean and tidy. Print and tick off each task:
✅ Block Paving Cleaning Checklist
🔲 Remove furniture and clear debris
🔲 Pull weeds and apply moss killer (if needed)
🔲 Sweep surface with a stiff broom
🔲 Pressure wash (or scrub with cleaner and rinse)
🔲 Let surface dry fully (24–48 hours)
🔲 Re-sand joints with kiln-dried sand
🔲 Sweep away excess sand
🔲 (Optional) Apply block paving sealant
🔲 Inspect for any damage or uneven blocks
🔲 Enjoy your refreshed paving!
