Brick and Stone Surface Cleaning: The Professional Approach

For valuable facades, historic masonry, or large areas, we recommend professional cleaning. The investment (typically $300–800 for a house facade) is cheap compared to mortar repointing or brick replacement if you damage it yourself.

Cost Expectations

Professional brick and stone cleaning costs vary by region, surface area, and soiling level:

– House facade: $400–1,000
– Chimney: $150–400
– Patio/walkway (per sq ft): $1–3
– Stone entryway or feature: $200–600

Heavily soiled surfaces or historic masonry requiring specialized cleaning cost more. Get multiple quotes and ask about the specific cleaning method they plan to use (low-pressure wash, chemical cleaning, etc.).

Preventive Care Between Cleanings

Keep brick and stone looking good longer:

– Trim vegetation away from masonry (reduces moisture and algae)
– Ensure proper drainage around foundations and walkways (reduces staining and efflorescence)
– Clean gutters and downspouts regularly (prevents water staining)
– Allow surfaces to dry between rain events (reduces algae growth)
– Consider sealers for porous brick in areas prone to algae/moss

Restoration vs. Cleaning

If your brick or stone has been power washed improperly, or if mortar is deteriorating, that’s beyond cleaning. You need repointing or professional restoration. This is a specialized, expensive service (usually $50–100+ per square foot for repointing) but essential for structural integrity. If you suspect damage, consult a mason, not a cleaner.

The Bottom Line

Brick and stone masonry is beautiful but requires specialized cleaning techniques. Low-pressure washing (500–1,500 PSI) with appropriate chemical solutions safely removes dirt and biological growth without damaging mortar or brick. DIY cleaning works for light soiling with mild methods, but valuable or historic masonry deserves professional care. If you’ve had brick or stone damaged by aggressive power washing in the past, consider restoration by a mason before next cleaning. Treated properly, brick and stone can be cleaned every 5–10 years and look beautiful for cen

Brick and stone chimneys, patios, walkways, and facades are hallmarks of classic Bucks County homes. Over years, these surfaces accumulate dirt, moss, stains, and organic growth that can make beautiful masonry look dull and neglected. We’ve worked with homeowners who thought high-pressure power washing was the answer and were horrified to discover it damaged or eroded their brick and stone. The truth is, brick and stone require completely different cleaning approaches than vinyl siding or deck boards. In this guide, we’ll explain why, and walk through the professional methods that safely restore these surfaces.

Why Power Washing Damages Brick and Stone

High-pressure power washing—the kind that’s safe for concrete and siding—can seriously damage brick and stone. Here’s why:

Mortar deterioration: Standard power washing (2,500–4,000 PSI) can erode mortar joints between bricks or stones. Mortar is softer than the brick itself, and high pressure literally blasts it away. Once mortar is compromised, water can penetrate behind the brick, causing frost damage, efflorescence, and structural problems.

Brick spalling: The surface of older brick can flake or chip if exposed to high-pressure water jets, especially on old, soft brick. This damage is irreversible and ruins the appearance.

Water intrusion: Aggressive cleaning can force water deep into brick and stone, causing damage that becomes apparent only months later. Frost cycles cause water trapped inside to expand and crack the masonry from within.

We’ve seen beautiful historic brick facades damaged by overeager power washing that took years and thousands of dollars to properly restore. This is why professionals use low-pressure methods for brick and stone.

The Professional Approach: Low-Pressure Cleaning

Pressure level: Professional brick and stone cleaning uses 500–1,500 PSI—a fraction of what’s used on siding or concrete. At these pressures, water gently removes surface dirt and biological growth without damaging mortar or brick.

Specialized cleaners: Low-pressure cleaning often requires chemical assistance. Professional cleaners use specialized solutions formulated for brick and stone that break down dirt, algae, and mineral deposits without degrading the material. These are different from generic power wash solutions.

Technique: The cleaning proceeds slowly, allowing the solution time to work before rinsing. A professional will soak the surface, let the cleaner work for 10–20 minutes, then gently rinse. Multiple passes may be needed for heavily soiled surfaces. This is not the aggressive, high-speed approach of power washing driveways.

Equipment: Professional brick cleaners use soft-bristle brushes or low-pressure wash systems designed for masonry, not standard power washers. Some use foaming systems that keep the cleaner in contact with the surface longer, improving effectiveness.

What Type of Brick and Stone Determines Cleaning Approach

Historic/old brick: Soft, porous brick from pre-1950s homes requires the gentlest approach. Sometimes even low-pressure washing is too aggressive. These might need chemical cleaning only, with mechanical brushing if at all.

Modern brick: Newer brick (post-1970s) is denser and harder, tolerating slightly higher pressure (800–1,200 PSI) than historic brick, but still lower than what you’d use on siding.

Limestone and sandstone: These sedimentary stones are softer than granite and require very gentle treatment. Low-pressure, chemical-first approach is essential. Some professionals avoid water entirely on fine limestone, using chemical poultices instead.

Granite and slate: Much harder and more forgiving, these can tolerate slightly higher pressures (1,500–2,000 PSI) than softer stones, but still require care around joints and fissures.

Common Brick and Stone Problems and Solutions

Efflorescence (white/gray haze): Mineral salts leaching to the surface, creating a chalky appearance. This is moisture-related and usually temporary. Gentle chemical cleaning removes it, but addressing the moisture source prevents recurrence.

Algae and moss growth: Green or black growth on shaded areas. Chemical cleaners formulated for algae/moss (often with sodium percarbonate or similar) are applied, allowed to sit, then gently rinsed. Moss on roofs requires pressure <500 PSI or chemical only.

Mortar staining: Gray dust or staining on brick face from old mortar repointing. Usually requires specialized poultice (clay paste) applied to the stain, allowed to dry, then gently removed. Water and soft brushing complete the cleaning.

Biological staining (lichen): Orange, red, or yellow crusty growth. Requires specific cleaners designed for this type of lichen and more time for the chemical to work. Multiple applications may be needed.

DIY Cleaning vs. Professional Service

Can you clean brick and stone yourself? Technically yes, but carefully:

Safe DIY approaches:
– Manual brush cleaning with mild soap and water
– Vinegar and baking soda paste for light staining
– Commercial “safe for masonry” brick cleaners (follow label instructions exactly)

Avoid DIY: