How to Deep Clean Exterior Brick Without Damaging Mortar

Brickwork is the backbone of a sturdy home, but time, soot, and organic growth inevitably leave their mark on the masonry. Many homeowners make the mistake of reaching for a high-pressure washer, which can slice through aged mortar and spall the face of the brick, leading to irreversible structural damage and water intrusion. Cleaning brick effectively is a game of patience and chemistry rather than raw force. Done well, your home's facade will regain its original color and texture without losing a single grain of sand from your mortar joints. By sticking to gentle brushes and non-acidic cleaners, you preserve the integrity of the building envelope while reviving its curb appeal.

1. Sweep Away Loose Debris. Use a stiff, dry nylon-bristle brush to sweep away loose dirt, cobwebs, and organic debris from the brick face. Work from the top of the wall down to ensure you aren't dragging filth over already cleaned sections.
2. Saturate the Wall First. Saturate the brick and mortar thoroughly with plain water from a standard garden hose. Porous brick must be saturated so it does not absorb the cleaning solution deep into its pores.
3. Test Before Full Application. Mix a mild pH-neutral masonry cleaner or a solution of water and grease-cutting dish soap in a bucket. Apply the solution to a small 4-by-4 foot section using a soft-bristle masonry brush or a pump sprayer.
4. Scrub in Circular Motion. Let the cleaner sit for five to ten minutes, ensuring it does not dry out. Use a soft-to-medium nylon brush to scrub the brick in circular motions, focusing on areas with heavy grime or mold.
5. Rinse All Soap Away. Rinse the section thoroughly with a garden hose using a gentle spray setting. Move from the top down, ensuring all soapy residue is removed from the mortar joints.
6. Check Mortar and Results. Inspect the mortar joints for any signs of loosening or pitting. Once the brick is dry, assess if a second pass is required for stubborn stains.