A clean brick wall can instantly boost your home’s kerb appeal and give it that just-renovated feel—without actually renovating. But over time, grime, algae and pollution can dull the colour and damage the surface of even the best-quality bricks.
The good news? You don’t need harsh chemicals or fancy equipment. With a few simple tools and the right method, you can refresh your brickwork and make it last longer.
Why Clean Brick Walls?
Moss, dirt, and soot don’t just affect how your home looks – they also wear away at the brick and mortar over time. Regular cleaning helps:
- Preserve colour and surface texture
- Prevent moisture damage and frost-related cracking
- Deter mould and allergens
- Increase energy efficiency (clean bricks dry faster and insulate better)
- Maintain your home’s overall value
And if you’re renovating or maintaining a period property, visible care goes a long way in keeping things compliant and attractive.
Start with a Check
Before grabbing your bucket and brush, give the wall a quick inspection.
Common stains to look out for:
- Algae or moss: Usually green or black and thrives in damp, shaded spots
- Efflorescence: White powdery salt deposits from water movement
- Pollution/soot: Grey or black film from nearby traffic
- Organic stains: Rust, fallen leaves, or berries
- Oil or grease: Often found near BBQs or driveways
Identifying the stain type will help you choose the right cleaner and avoid damaging the brickwork.
Don’t clean damaged walls
Check for loose bricks, cracked mortar, or signs of spalling (flaking). Clean these areas only after repairs are made.
Tools + Products to Use
- Soft or stiff-bristled brush (no metal bristles)
- Bucket, sponge, and clean water
- Mild detergent or a brick-safe cleaner
- Plastic sheeting to protect plants and paving
- Garden hose with spray nozzle
For tougher spots like moss or salt, choose products designed for masonry. Where possible, go for eco-friendly, biodegradable cleaners to minimise environmental impact.
Safety first:
Wear gloves, goggles, and a dust mask. If using ladders, make sure they’re secure. Cover outdoor sockets and keep pets and children well out of the way.
Step-by-Step Cleaning Guide
1. Brush Off Loose Dirt
Use a dry brush to sweep away dust, cobwebs, and debris from top to bottom.
2. Wash With Soapy Water
Mix mild soap with warm water and apply using a sponge or soft brush. Avoid saturating the mortar. Always test a small hidden spot first.
3. Tackle Stains
To remove brick wall stains, try a diluted vinegar solution (1 part vinegar to 10 parts water) for algae or mould. Let it sit for 10 minutes, then scrub gently.
Efflorescence (the white powder) should be brushed off dry – don’t add water, or it could come back. For oils or heavy staining, use specialist brick cleaners following the label.
4. Rinse Gently
Use a garden hose (not a pressure washer) to rinse off suds and residue. Let the wall dry naturally—ideally on a mild, breezy day.
Maintenance Tips
To keep your walls looking their best:
- Brush off dirt and debris every few months
- Rinse annually with water
- Prune back plants that keep areas damp
- Check and clear gutters regularly
- Repoint mortar if you spot any cracks or gaps
Should You Seal It?
A breathable water-repellent sealant can reduce moisture absorption, help prevent frost damage and slow algae growth. It’s especially useful for exposed or weather-beaten walls. Just make sure to test a small area first and follow the manufacturer’s guidelines. Reapply every 5–10 years as needed.
Cleaning your brick walls is an easy win for both looks and longevity. With a little time and care, you can enhance your home’s appearance, prevent long-term damage, and keep things looking polished year-round.
