How to clean brickwork without damaging it

Most brick cleaning problems we see are not dirty bricks. They are bricks damaged by harsh cleaning. The face of a brick is the toughest, most weatherproof part, and once it is stripped off the brick ages much faster.

Start gentle

Always begin with the mildest method and only step up if you have to.

• A stiff brush and plain water clears most surface dirt, dust, and light grime.
• Add a little mild detergent for general muck, then rinse properly.
• For moss and mould, a soft wash with an appropriate cleaner works better than blasting.

Give any method time to work. Patience does more than force.

Be careful with pressure washers

High pressure feels efficient, but it is one of the quickest ways to wreck older brickwork.

• It can blow out soft mortar joints and force water deep into the wall.
• It can erode the brick face, leaving it rough, open, and prone to holding more dirt later.
• On period homes especially, the bricks are often soft and will not take it.

If you do use one, keep the pressure low, use a wide fan tip, and keep the nozzle well back.

Acids and harsh chemicals

Acid cleaners have a place for specific jobs like removing mortar smears on new work, but they are easy to get wrong.

• Used carelessly they burn the brick, bleach the colour, and can trigger efflorescence later.
• They need the wall wet first, careful dilution, and a thorough rinse.
• A random bottle of acid from the hardware shop is not a safe default.

If your bricks are stained, painted, or covered in something stubborn, it is worth getting the right method matched to the actual problem rather than guessing. Send us a photo of the wall and your suburb and we will tell you the gentlest thing that will actually work.