What Are the Best Soft Washing Chemicals and How Do They Safely Clean Your Home?

How Does Soft Washing Work Compared to Pressure Washing? Soft washing is a low-pressure cleaning technique that uses water-based, biodegradable soft washing chemicals to clean exterior surfaces. Unlike pressure washing, which relies on high-pressure water to remove dirt and grime, soft washing depends on specifically formulated cleaning solutions to target organic matter like mold, mildew, moss, and algae. The dwell time, the period these chemicals sit on a surface, is essential for soft washing to be effective. This method gently breaks down contaminants so they can be rinsed away without damaging the material underneath. Pressure washing is still useful in many scenarios, especially when removing stubborn oil or grime from hard surfaces like concrete or metal. However, its forceful stream can harm delicate areas such as siding, roofs, or windows. That’s why homeowners are increasingly turning to soft washing for a gentler yet highly effective alternative to maintain the integrity of their homes. Why Are Soft-Washing Chemicals More Effective on Certain Surfaces? Soft washing chemicals are uniquely designed to eliminate contaminants that grow and stick to surfaces over a long period. Unlike generic cleaning products, these solutions are mixed with surfactants—agents that help the chemical cling to surfaces—and penetrants that break down organic material at the root. This means they don’t just wash away surface dirt but address the source of stains and bacterial growth. Surfaces such as asphalt shingles, tile roofs, vinyl siding, and painted wood benefit from soft washing because these materials can be damaged by high-pressure water. For example, the Asphalt Roofing Manufacturers Association recommends non-pressure or soft washing to clean roof shingles in order to avoid granule loss and extend roof life (ARMA). Soft washing ensures a deep clean while preserving the surface’s structural integrity. What Is in a Typical Soft Washing Solution? A typical soft washing solution contains three main components: a cleaning agent, a surfactant, and water. The most common cleaning agent is sodium hypochlorite, which is essentially the same as household bleach but at a higher concentration. This chemical effectively eliminates mold, mildew, algae, and bacteria on contact. It is often combined with surfactants—like dish soap or biodegradable detergents—that increase the dwell time by helping the solution stick to the surface. The solutions are then diluted with water to reduce their intensity and sprayed onto the area being cleaned. Other additives may include sodium hydroxide for grease and oil removal on tougher surfaces like dumpster pads or concrete, and rust or iron removal agents for specialized treatments. These cleaning solutions are specifically formulated depending on the surface and type of grime being treated. Why Is Sodium Hypochlorite a Key Ingredient in Soft Washing? Sodium hypochlorite is the powerhouse chemical in many soft washing applications. It has strong oxidizing properties, making it incredibly effective at killing mold, mildew, and bacteria. According to the Centers for Disease Control and Prevention (CDC), sodium hypochlorite solutions are used in disinfecting and sanitation processes due to their ability to eliminate a wide range of pathogens (“Chemical Disinfectants”). In soft washing, sodium hypochlorite not only breaks down organic matter but also deodorizes and eliminates foul smells caused by microbial growth. It is especially effective on roofs and siding where black streaks—often caused by Gloeocapsa magma algae—tend to accumulate. When used correctly, this chemical can drastically enhance the appearance and hygiene of your home’s exterior without the need for abrasive pressure. Can Dish Soap or Household Products Be Used in Soft Washing? Dish soap and other household detergents can serve as surfactants in soft washing solutions, helping to increase adhesion and control the flow of the mixture on vertical or porous surfaces. While they aren’t powerful cleaners on their own, when combined with sodium hypochlorite or other active chemicals, they boost the overall effectiveness of the solution. However, it’s crucial to use soaps that are biodegradable and safe for the environment. Many professional-grade products used in soft washing are engineered to be eco-friendly and safe around plants and pets, reducing runoff risk. DIYers attempting to replicate soft washing should avoid mixing random chemicals, as improper combinations can result in harmful fumes or ineffective cleaning. What Types of Surfaces and Stains Respond Best to Soft Washing? Soft washing is especially effective for removing stains and buildup from delicate or porous surfaces, including: This method is ideal for cleaning: Thanks to its low-pressure application and effective chemical solutions, soft washing treats these surfaces thoroughly without causing damage. Proper dwell time ensures deep penetration, making it safe and effective for a wide range of exterior cleaning needs. How Does Soft Washing Handle Contaminants Like Oil, Rust, and Algae? Soft washing can be adapted to remove a wide range of contaminants, from rust stains to stubborn oil spots. Sodium hydroxide is a common additive used to break down grease and oil, making it ideal for cleaning dumpster pads, garage floors, and other surfaces exposed to petroleum-based grime. For rust removal, specialty rust removers are added to the solution. Algae and mold are common problems on the exterior of homes in humid climates, especially on roofs and siding. Soft washing chemicals not only remove these organisms but also kill their spores, helping prevent rapid regrowth. This creates a longer-lasting clean than simply blasting off visible growth with pressure. Moreover, the solution can be sprayed evenly and allowed to dwell, ensuring full saturation of contaminants before being rinsed away. What Is the Environmental and Health Impact of Soft Washing Chemicals? Environmental and safety concerns are common when it comes to chemical cleaning, but most soft washing professionals use biodegradable products that minimize risk to humans and ecosystems. Sodium hypochlorite, while potent, breaks down quickly into salt and water when exposed to sunlight and oxygen. Still, it must be handled properly. When used incorrectly, chemicals can cause irritation or release harmful fumes. This is why personal protective equipment (PPE) and proper ventilation are essential when preparing or applying soft washing solutions. Reputable companies like Mr. Suds Softwash follow Environmental Protection Agency (EPA) guidelines for chemical application