What is Soft Washing? A Complete Guide

Maintaining the exterior of your home is just as important as keeping the interior spotless. Over time, dirt, algae, mold, mildew, and other contaminants can accumulate on your home’s surfaces. Not only do these elements ruin your home’s curb appeal, but they can also cause long-term damage if left untreated.

While traditional pressure washing has been the go-to solution for decades, there’s a gentler, more effective alternative that’s quickly gaining popularity—soft washing.

At Shark Pressure Washing, we believe in using the safest and most efficient methods to protect and enhance your property. In this guide, we’ll explain:

Understanding the Concept of Soft Washing

Soft washing is a low-pressure cleaning technique that uses a water-based, biodegradable chemical solution to safely clean and sanitize exterior surfaces. This method was originally developed to clean roofs without causing damage to shingles. Today, it is widely used for various parts of a property, including siding, stucco, decks, fences, patios, and even outdoor furniture.

Unlike pressure washing, which relies on sheer water force to blast away dirt, soft washing focuses on chemically treating and killing the root cause of stains, such as mold, algae, and mildew. By combining low-pressure water with specialized cleaning agents, soft washing achieves a deep, long-lasting clean without damaging delicate surfaces.

How Soft Washing Works

The soft washing process begins with the application of a cleaning solution to the surface. This solution typically contains sodium hypochlorite (a bleach derivative), surfactants to help the chemical adhere to the surface, and water. The mixture is carefully prepared to ensure effectiveness while remaining safe for nearby landscaping and structures.

Once applied, the solution is allowed to sit for a specific amount of time, referred to as “dwell time.” During this period, the chemicals break down dirt, grime, and biological growth at the root level. After the solution has had time to work, the surface is gently rinsed with clean, low-pressure water. This final rinse removes the loosened debris, leaving the surface clean and sanitized.

Because it targets the underlying cause of staining rather than just washing away the visible residue, soft washing provides results that last significantly longer than pressure washing.

The Difference Between Soft Washing and Pressure Washing

It is important to understand the key differences between soft washing and pressure washing. While both methods are used to clean exteriors, their techniques and results differ greatly.

Soft washing uses very low pressure—typically under 500 PSI—and focuses on chemical cleaning. It is ideal for surfaces that could be damaged by high pressure, such as asphalt shingles, painted wood, vinyl siding, and stucco.

In contrast, pressure washing relies solely on high water pressure, often exceeding 2,000 PSI. This method is effective for cleaning hard surfaces like driveways, sidewalks, and brick walls, but it can cause serious damage to more delicate materials.

Soft washing kills mold and algae at the root, which means it not only cleans but also prevents regrowth. Pressure washing, by comparison, often only removes surface-level grime, allowing mold and algae to return much more quickly.

Advantages of Soft Washing

One of the most significant benefits of soft washing is its gentle nature. Since it uses low-pressure water, there is virtually no risk of surface damage. This makes it particularly suitable for older homes or fragile structures that cannot withstand the force of a pressure washer.

Another advantage is its long-lasting effectiveness. Because soft washing eliminates the microorganisms that cause staining, it keeps surfaces clean for a longer time. In many cases, a single soft washing treatment can last up to a year or more, depending on environmental conditions.

Soft washing is also environmentally responsible when done professionally. Many contractors use biodegradable, eco-friendly solutions that are safe for plants, pets, and people. The targeted cleaning approach means fewer chemicals are needed, and because soft washing requires less water than pressure washing, it conserves resources.

Finally, soft washing can greatly improve the appearance and value of your property. A clean exterior boosts curb appeal and helps protect surfaces from the damaging effects of organic growth.

When to Consider Soft Washing for Your Home

Homeowners should consider soft washing when they notice stains, streaks, or signs of mold or mildew on their roofs, siding, or outdoor structures. Green or black discoloration, especially on the north-facing side of a house or in shaded areas, is often a sign of algae growth that requires treatment.

Soft washing is also an excellent idea before selling a home, as it instantly improves the appearance of the property. Many real estate professionals recommend exterior cleaning to enhance the presentation of homes for sale.

In areas with high humidity or lots of trees, homes are more likely to develop organic buildup and may need soft washing more frequently. Most professionals recommend soft washing every 12 to 18 months to maintain cleanliness and prevent long-term damage.

Choosing a Professional Soft Washing Service

When selecting a soft washing service, it is important to choose a reputable and experienced provider. A qualified professional will use the correct chemical solutions, proper equipment, and safe techniques to ensure the job is done thoroughly and safely. Look for companies that are licensed, insured, and have strong customer reviews. Always ask about the type of chemicals used and whether they are safe for landscaping and pets.

Avoid companies that simply use a pressure washer at low settings, as this is not true soft washing and may still damage delicate surfaces. A dedicated soft washing system includes specialized nozzles, pumps, and mixing tanks designed for low-pressure chemical application.

Frequently Asked Questions About Soft Washing

Is soft washing safe for my roof?

Yes, soft washing is specifically designed for roof cleaning. It is the safest method for asphalt shingles and prevents the loss of granules that high-pressure washing can cause.

How long do soft washing results last?

The results typically last between 12 and 18 months, depending on environmental conditions. Because it removes contaminants at the source, it provides longer-lasting cleanliness than pressure washing.

Are the chemicals used in soft washing harmful?

Professional soft washing solutions are diluted, biodegradable, and safe for most plants and animals when applied correctly. Experts also take precautions like pre-wetting plants to minimize risk.

Can I do soft washing myself?

While DIY soft washing kits exist, it’s easy to get the chemical mix wrong or use the equipment improperly. Hiring a professional ensures safety and effectiveness.

How much does soft washing cost?

Costs vary depending on the size of the home and the areas being cleaned. On average, homeowners can expect to pay between $300 and $800 for a professional soft washing service.