The Benefits of Soft Washing Brick Siding
- Kirk Foster
- Dec 15, 2025
- 3 min read
Brick siding adds charm and durability to homes, but over time, dirt, algae, mold, and mildew can accumulate on its surface. Cleaning brick siding is essential to maintain its appearance and structural integrity. Traditional pressure washing can sometimes damage the brick or mortar, leading to costly repairs. Soft washing with sodium hypochlorite offers a safer, more effective alternative that preserves the brick while thoroughly cleaning it.
What Is Soft Washing and Why It Matters for Brick Siding
Soft washing is a cleaning method that uses low-pressure water combined with specialized cleaning solutions to remove dirt, algae, mold, and other contaminants. Unlike high-pressure washing, soft washing avoids blasting the brick surface, which can erode mortar joints or chip bricks.
Sodium hypochlorite, a common ingredient in bleach, is the primary cleaning agent in soft washing. It effectively kills organic growth and loosens stains without harsh scrubbing or damaging pressure.
For brick siding, soft washing is ideal because:
Brick is porous and can absorb water; high pressure forces water deep, causing damage.
Mortar joints are vulnerable to erosion from strong pressure.
Soft washing preserves the brick’s natural texture and color.
It reaches areas that pressure washing might miss or damage.
How Sodium Hypochlorite Works in Soft Washing
Sodium hypochlorite is a powerful oxidizing agent that breaks down organic matter such as algae, mold, mildew, and moss. When applied in a diluted solution during soft washing, it:
Penetrates the porous brick surface to kill spores and roots.
Loosens dirt and stains for easy rinsing.
Prevents regrowth by disinfecting the surface.
Works quickly, often requiring only 10 to 15 minutes of dwell time before rinsing.
The concentration of sodium hypochlorite is carefully controlled to avoid damaging the brick or surrounding plants. Typically, a solution between 0.5% and 2.0% is used depending on the severity of staining.
Benefits of Soft Washing Brick Siding with Sodium Hypochlorite
1. Protects Brick and Mortar Integrity
High-pressure washing can erode mortar joints and chip bricks, leading to costly repairs. Soft washing uses low pressure and a gentle chemical solution, preserving the brick’s structure and extending its lifespan.
2. Removes Stubborn Organic Stains
Algae, mold, and mildew can cause unsightly green or black stains on brick siding. Sodium hypochlorite kills these organisms at the root, removing stains that scrubbing alone cannot eliminate.
3. Prevents Future Growth
Soft washing disinfects the surface, reducing the chance of mold and algae returning quickly. This means your brick siding stays cleaner longer, reducing maintenance frequency.
4. Enhances Curb Appeal
Clean brick siding instantly improves the look of your home. Soft washing restores the brick’s natural color and texture, making your property more attractive and potentially increasing its value.
5. Environmentally Responsible When Done Correctly
When applied with care, sodium hypochlorite breaks down quickly and does not persist in the environment. Using proper dilution and rinsing techniques minimizes any impact on plants or soil near the home.
Step-by-Step Soft Washing Process for Brick Siding
Inspection
Check the brick siding for damage, loose mortar, or areas needing repair before cleaning.
Preparation
Cover plants, electrical outlets, and windows to protect them from the cleaning solution.
Mixing Solution
Prepare a sodium hypochlorite solution at the recommended concentration based on the level of staining.
Application
Apply the solution evenly using a low-pressure sprayer, ensuring full coverage.
Dwell Time
Allow the solution to sit for 10 to 15 minutes to break down stains and kill organisms.
Rinsing
Rinse thoroughly with low-pressure water to remove all residues.
Final Inspection
Check for any missed spots or damage and address as needed.
Safety Tips When Using Sodium Hypochlorite for Soft Washing
Always wear protective gear such as gloves, goggles, and long sleeves.
Avoid mixing sodium hypochlorite with other chemicals, especially acids.
Test the solution on a small, inconspicuous area first.
Protect nearby plants and landscaping by covering or rinsing them after cleaning.
Follow local regulations for disposal of rinse water.
Real-Life Example of Soft Washing Brick Siding
A homeowner in a humid climate noticed green algae stains spreading across their brick siding. They hired a professional soft washing service that used a 1.5% sodium hypochlorite solution. After treatment and rinsing, the brick looked like new without any damage. The algae did not return for over a year, saving the homeowner time and money on frequent cleanings.
When to Choose Soft Washing Over Pressure Washing
Soft washing is the best choice when:
Your brick siding has organic stains like mold or algae.
The mortar joints show signs of wear or erosion.
You want to avoid potential damage from high pressure.
You prefer a longer-lasting clean with less frequent maintenance.
Pressure washing may still be suitable for very durable surfaces or when removing loose dirt, but it should be avoided on delicate brick siding.
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