Cleaning Old Bricks Safely Without Damage
Old brick walls hold a unique charm and history — whether they're part of a period home, a garden wall, or a reclaimed feature.
However, over time, bricks naturally accumulate dirt, moss, algae, and pollution stains.
Cleaning them properly is important to preserve their beauty and structure — but cleaning too aggressively can cause permanent damage.
In this guide, we'll explain how to clean old bricks carefully, the techniques to use, and common mistakes to avoid to keep your brickwork looking its best.
Why Cleaning Old Bricks Needs Special Care
Unlike modern bricks, older bricks (especially Victorian and Georgian ones) were often fired at lower temperatures.
This made them softer, more porous, and more fragile compared to today's bricks.
Using harsh cleaning methods can:
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Erode the brick surface,
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Damage mortar joints,
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Allow water to penetrate and cause damp problems later.
Preserving the integrity of the brickwork is just as important as restoring its appearance.
(Related reading: Explore Our Brick Collections)
Safe Methods for Cleaning Old Brickwork
Here are the gentlest and most effective ways to clean older bricks:
1. Dry Brushing
For light dust and dirt:
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Use a soft to medium-stiffness bristle brush (not wire).
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Gently brush the surface to remove loose material.
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Avoid using excessive force that could scratch the brick face.
Dry brushing is often the safest first step, especially for indoor exposed brickwork.
2. Low-Pressure Water Washing
If dry brushing isn't enough:
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Use a low-pressure garden hose, never a power washer.
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Wet the bricks lightly to loosen dirt.
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Brush gently during and after rinsing.
✅ Important: Always allow the bricks to dry naturally afterward.
Avoid soaking them fully or directing water into mortar joints.
3. Mild Soapy Solution
For stubborn dirt or light staining:
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Mix a small amount of neutral pH soap (like a gentle household cleaner) into warm water.
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Apply with a soft sponge or brush.
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Rinse carefully with a low-pressure hose.
✅ Avoid acid-based cleaners unless specifically designed for brickwork — they can etch the surface.
4. Specialist Brick Cleaning Products
For tougher stains (like pollution, algae, or paint residue), use a professional brick cleaner designed for heritage materials.
Look for:
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Products labelled safe for use on old bricks,
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Solutions free from harsh acids or abrasives,
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Cleaners that are biodegradable and non-toxic.
(Need help choosing the right cleaning method? Contact Heritage Brick Company for advice.)
What to Avoid When Cleaning Old Bricks
❌ High-Pressure Jet Washing
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Jet washing can strip away the outer face of bricks and erode mortar.
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It forces water deep into the structure, creating future damp issues.
❌ Wire Brushes and Metal Scrapers
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These scratch and scar soft historic bricks.
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Always choose natural or synthetic bristles instead.
❌ Harsh Chemicals
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Avoid acid cleaners unless absolutely necessary — even then, use a professional.
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Some chemicals cause long-term salt damage (efflorescence) after cleaning.
❌ Over-Wetting
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Saturating bricks can weaken the wall over time.
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Use as little water as possible and allow for full drying between cleaning stages.
When to Consult a Professional
If you notice any of the following:
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Crumbling, spalled, or fragile bricks,
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Historic or listed building status (special rules apply),
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Severe staining, heavy moss, or graffiti,
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Loose or cracked mortar,
✅ It's best to contact a professional with experience in heritage masonry conservation.
They can recommend the safest treatment — and in some cases, repairs may be needed before cleaning.
Final Thoughts: Gentle Approach, Long-Lasting Results
Old brickwork has survived the test of time —
with the right approach, careful cleaning can help it stay beautiful and structurally sound for many more years.
At Heritage Brick Company, we’re passionate about helping homeowners and builders preserve the character and craftsmanship of traditional brick walls.
If you need advice on brick cleaning, restoration, or sourcing matching bricks for your project, get in touch today — we're here to help.
