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The Most Effective Way to Clean Your Roof: A Homeowner's Guide to Soft Washing

Joshua Darrow

Professional Roof Cleaning

Your roof is one of the most essential parts of your home, protecting it from the elements and maintaining its structural integrity. Over time, however, moss, algae, and other organic growth

can take root, not only making your roof look unsightly but also causing long-term damage if left untreated. If you've noticed streaks, discoloration, or green patches on your roof, it might be time to consider soft washing—the roofer-recommended method for safe and effective roof cleaning.

What Is Soft Washing?


Soft washing is a gentle yet highly effective cleaning method that involves applying a specialized algaecide solution—typically a mixture of water, bleach (sodium hypochlorite), and a surfactant—to eliminate moss, algae, and other organic growth on your roof. Unlike pressure washing, which can damage shingles or tiles, soft washing relies on the chemical action of the cleaning solution to break down and kill the growth without high-pressure water.

Why Moss and Algae Are Bad for Your Roof

Moss and algae might seem like harmless green patches, but they can have serious consequences for your roof:

  1. Shingle Damage: Moss retains moisture, which can seep under shingles and cause them to lift or deteriorate.

  2. Reduced Lifespan: Algae, particularly the black streaks caused by Gloeocapsa magma, can degrade asphalt shingles by feeding on the limestone filler within them.

  3. Increased Energy Costs: Dark streaks caused by algae absorb more heat, making your home warmer and forcing your HVAC system to work harder.

  4. Structural Issues: Prolonged moisture from moss and algae can lead to wood rot, compromising the integrity of your roof deck.


The Roof Cleaning Soft Wash Process

Moss Removal
When the Moss turns WHITE you're doing it RIGHT!

Soft washing is straightforward but requires attention to detail and safety precautions. Here’s a breakdown of how it works:

  1. Preparation: Start by removing any loose debris, such as leaves or branches, from your roof with a gentle roof blow-off. Protect landscaping around your home by wetting plants and covering them with tarps if needed.

  2. Mix the Cleaning Solution: Combine bleach, water, and a surfactant in a pump sprayer. A common mixture is a 50/50 ratio of water and bleach with a small amount of surfactant to help the solution stick to the roof surface. Be cautious not to use a mixture that’s too strong, as it can damage shingles and surrounding plants.

  3. Apply the Solution: Using a pump sprayer, evenly coat the affected areas of your roof with the cleaning solution. Start from the top and work your way down to avoid streaking. Allow the solution to sit for 15-20 minutes to kill moss, algae, and other growth. This pump sprayer method is a DIY approach for homeowners, but it requires patience and care.

  4. Let the Rain Do the Work: After the 15-20 minute dwell time, you don’t need to rinse the roof. Let the rain naturally wash the solution down over time. Check the roof to see if there are any remaining black streaks. If so, reapply the algaecide treatment to those areas for complete coverage.


Can You DIY Soft Washing?

While it’s possible for homeowners to soft wash their roofs using a pump sprayer and the proper cleaning solution, there are significant risks involved:

  • Safety Concerns: Working on a roof can be dangerous, especially for those without proper training or equipment.

  • Chemical Handling: Bleach mixtures must be handled with care to avoid damaging plants, surfaces, or yourself.

  • Potential Damage: Using the wrong solution strength or applying it improperly can harm your roof and surrounding areas.


Why It’s Best to Hire a Professional

For most homeowners, hiring a professional roof cleaning service is the safest and most effective option. Professionals have the experience, equipment, and knowledge to:

  • Use the correct chemical mixtures to clean your roof without causing damage.

  • Ensure safety while working at heights.

  • Provide long-term protection with treatments that prevent moss and algae from returning.

Unlike the DIY pump sprayer method, professionals like Mr. Pristine use specialized equipment designed for efficient and thorough roof cleaning. This ensures that the job is done right the first time, without risk to your roof or surrounding property.


Final Thoughts

Soft washing is the roofer-recommended method for maintaining a clean, healthy roof. By addressing moss and algae early, you can prevent costly damage and extend the life of your roof. While DIY soft washing is an option, the risks often outweigh the benefits, making professional roof cleaning a smart investment.

If you’re in the Snohomish, WA area, Mr. Pristine offers expert roof cleaning services, including soft washing and algaecide treatments with a 2-year no-moss-back warranty. Contact us today to schedule your roof care and keep your home looking its best!

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