Safely Cleaning Brick and Historic Masonry

Brick is one of the most enduring building materials in the world. It is also one of the easiest to damage with the wrong cleaning approach. Across Western North Carolina, brick homes, commercial storefronts, chimneys, retaining walls, and patios are defining features of the landscape. Many of these structures have been standing for decades, and some for more than a century.

Over time, brick and masonry surfaces accumulate dirt, algae, mold, mildew, and mineral staining that dull their appearance and gradually weaken the material. The instinct to reach for a pressure washer is understandable, but high-pressure water can erode mortar joints, pit the face of older bricks, and force moisture deep into the wall structure, creating problems far worse than the stains you started with.

Mobile Magic has been helping property owners safely clean brick, stone, and masonry surfaces since 2001. Our softwash approach uses low-pressure pumps and 100% biodegradable cleaning solutions to remove buildup without risking damage. Every project is backed by our 100% satisfaction guarantee.

Quick Summary

Brick and historic masonry require low-pressure cleaning. High-pressure washing can erode mortar, pit brick faces, and force water into wall cavities.
Soft washing uses about as much pressure as a garden hose, combined with biodegradable solutions that break down algae, mold, and grime at the root level.
The age and condition of the brick determine which cleaning approach is appropriate. Older masonry needs the gentlest treatment.
Mobile Magic's softwash services explicitly include pavers, brick, and stone, along with house washing and exterior cleaning.
All cleaning chemicals are 100% biodegradable and safe for surrounding plants, pets, and landscaping.

Why Brick Needs a Different Cleaning Approach

Brick may be tough, but it is not invulnerable. Understanding what makes brick and mortar unique helps explain why standard pressure washing can cause so much harm.

Brick is a porous material that absorbs and releases moisture naturally. When high-pressure water is forced into the surface, it pushes water into areas where it becomes trapped. During cold weather, trapped moisture freezes, expands, and cracks the brick from the inside out. This damage is called spalling, and once it starts, it accelerates with every freeze-thaw cycle.

Mortar joints are even more vulnerable. Traditional lime-based mortar used in older buildings is softer than modern portland cement mortar, and high-pressure washing can erode it quickly. When mortar deteriorates, the structural integrity of the wall is compromised, and repointing is labor-intensive and expensive.

Common risks of using high pressure on brick and masonry include:

Eroded mortar joints that weaken structural integrity and allow water infiltration
Spalling, where the brick face chips or flakes after moisture is forced inside
Etching and pitting that permanently alters the brick's appearance
Water driven behind the wall, leading to interior moisture problems and mold
Damage to decorative details and architectural features that cannot be replaced

These risks increase significantly with older brick and historic masonry, where materials have had more time to weather and the original mortar is softer.

The Safe Method: Soft Washing Brick and Masonry

Soft washing is the safest and most effective method for cleaning brick, stone, and masonry. Unlike pressure washing, soft washing uses low-pressure pumps delivering about as much force as a garden hose. The cleaning power comes from biodegradable mildewcides, algaecides, and soaps custom-blended for each job.

This approach works particularly well on brick and masonry:

Low pressure does not erode mortar, pit brick faces, or force water into wall cavities
Biodegradable solutions kill algae, mold, and mildew at the root level rather than just blasting away surface growth
Custom blending allows the solution to be tailored to the specific buildup and masonry condition
The method uses less water than pressure washing, reducing overall moisture exposure
All chemicals are 100% biodegradable, protecting surrounding landscaping and gardens

How Mobile Magic Cleans Brick and Masonry

Our process follows a careful, methodical approach that prioritizes the safety of the surface:

The surface is assessed to determine age, condition, mortar type, and the nature of the buildup
Nearby plants and landscaping are pre-soaked or covered to prevent contact with solutions
A custom-blended biodegradable solution is applied at low pressure
The solution is given time to penetrate and break down organic growth, dirt, and staining
The surface is gently rinsed, and a final inspection confirms thorough results

This is the same careful approach we use across all of our house washing services. Property damage is a real concern when washing any home's exterior, because siding and masonry are not designed to withstand the massive pressure most pressure washers produce. Water can be forced into seals, behind siding, and into wall cavities where it leads to rot and mold. Low pressure is key to ensuring no damage is done.

Cleaning a 100-Year-Old Brick House

Asheville and the surrounding communities have a rich architectural heritage, and many homes and commercial buildings feature original brickwork that is 75, 100, or more years old. Cleaning historic brick requires extra care:

Softer mortar. Older buildings typically used lime-based mortar, which is significantly softer than modern portland cement mortar. Even moderate pressure can wash it away.
Weathered surfaces. Decades of exposure to rain, wind, and temperature changes make the surface more fragile and easier to damage.
Irreplaceable character. The patina and texture of historic brick are part of the building's identity. Aggressive cleaning can strip that away and leave the building looking raw.
Unique staining. Older brick often develops mineral deposits, efflorescence, and deeply embedded biological growth that require specialized solutions rather than brute force.

The soft wash approach addresses each of these challenges. By relying on carefully formulated solutions instead of high water pressure, we remove decades of buildup without disturbing the mortar, pitting the brick, or stripping away the character that makes historic masonry distinctive.

Common Problems on Brick Surfaces in Western North Carolina

The mountain climate creates specific challenges for brick and masonry maintenance. High humidity, abundant rainfall, dense tree canopy, and seasonal temperature extremes all contribute to the buildup that affects brick surfaces in this region:

Green and black algae. Thrives in shaded, damp areas and spreads across brick faces, especially on north-facing walls.
Mold and mildew. Develops in mortar joints and porous brick surfaces where moisture lingers.
Moss. Takes root in mortar joints and along wall bases where moisture is consistent. Root systems work into mortar and accelerate deterioration.
Efflorescence. White, chalky mineral deposits that form when water moves through brick, carrying dissolved salts to the surface.
Dirt and pollution. General grime accumulates over time, particularly near roadways and high-traffic zones.

Each of these issues responds well to a properly formulated soft wash treatment. Because solutions are custom-blended for each job, the approach can be calibrated to the specific combination of problems on your property.

Beyond the Walls: Brick Patios, Walkways, and Retaining Walls

Brick is not just for house exteriors. Many properties feature brick patios, walkways, garden walls, and retaining walls. These surfaces face the same challenges as brick walls, with the added factor of foot traffic, ground-level moisture, and direct soil contact.

Brick patios and walkways are especially prone to algae growth in shaded areas, creating a slip hazard when wet. Retaining walls collect moisture and can develop heavy moss and mildew growth on their faces. All of these surfaces benefit from the same soft wash approach we use on home exteriors.

Frequently Asked Questions

What is the best way to clean brick?

The safest and most effective method is soft washing. This approach uses low-pressure water (similar to a garden hose) combined with biodegradable cleaning solutions that break down algae, mold, and grime without damaging the brick or mortar. High-pressure washing can erode mortar joints, pit brick surfaces, and force water into the wall structure.

Can I pressure wash an old brick house?

We strongly advise against high-pressure washing on older brick homes. Older buildings typically have softer, lime-based mortar that erodes under high pressure. The brick itself is more weathered and vulnerable to spalling and pitting. Soft washing achieves a thorough clean while keeping brick and mortar intact.

How do you remove green algae from brick without causing damage?

Green algae responds well to a biodegradable soft wash treatment that kills the growth at the root level. The low pressure prevents surface damage, and the custom-blended solution eliminates the algae rather than just pushing it around. The treatment also helps prevent regrowth for an extended period.

Are your cleaning products safe for my garden and landscaping?

Every chemical Mobile Magic uses is 100% biodegradable. We pre-soak or cover all nearby plants before cleaning begins. Our softwash approach is designed to be safe for plants and animals.

How often should brick be professionally cleaned?

Frequency depends on shade, moisture exposure, and tree cover around the surface. Most brick homes and structures in Western North Carolina benefit from professional cleaning every few years. Properties with heavy tree canopy or damp, north-facing walls may need attention more frequently.

Do you clean brick patios and walkways as well as house exteriors?

Yes. Mobile Magic's softwash services include pavers, brick, and stone along with house washing and full exterior cleaning. We clean brick patios, walkways, retaining walls, and hardscape features using the same safe, low-pressure method we use on building exteriors.

Preserve Your Brick: Schedule a Professional Cleaning

Brick and masonry are built to last, but only when maintained properly. The wrong cleaning method can undo decades of durability in a single afternoon. Whether your property features a century-old brick facade, a newer brick veneer, or brick patios and walkways, soft washing is the safest way to restore its appearance without causing harm.

Mobile Magic has been serving property owners across Asheville and Western North Carolina since 2001 with commercial grade equipment and biodegradable cleaning solutions. Our team assesses every project individually and uses the proper method for the job.