How To Remove Green Mold From Wood? Latest Methods 2023

Green mold can be a common problem on wooden surfaces, such as furniture, decks, or siding. Not only does it look unsightly, but it can also cause health issues and damage to the wood if left untreated. 

In this article, we will provide you with effective methods to remove green mold from wood, ensuring a clean and healthy environment. Let’s dive in and learn how to tackle this issue head-on.

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Understanding Green Mold

Green mold, scientifically known as Cladosporium, is a type of fungi that commonly grows on damp or moist surfaces. It thrives in areas with high humidity levels and poor ventilation, making wooden surfaces an ideal breeding ground. 

Green mold appears as fuzzy patches or spots with a greenish hue. It not only affects the aesthetic appeal of wood but can also lead to respiratory issues and allergies.

how to remove green mold from wood

How To Remove Green Mold From Wood?

Now, we will explore various methods to remove green mold from wood decks and provide helpful tips to ensure a thorough cleaning process.

Preparing for Cleaning:

Before starting the cleaning process, it is important to remove all items from the deck and clear it of leaves, sticks, and debris. This will allow for a more effective cleaning and prevent any obstacles during the process.

Cleaning Small Decks:

For small decks, a scrub brush and a bucket of cleaning detergent mixed with water can be used. Scrub the affected areas thoroughly, paying attention to corners and crevices. Rinse the deck with clean water after scrubbing.

Cleaning Larger Decks:

Larger decks can be effectively cleaned with a pressure washer and detergent. Follow the owner’s manual when using a cleaning solution or detergent with a power washer. 

Apply the solution in a sweeping motion, starting from the farthest side or corner of the deck. Rinse the deck thoroughly with clean water after washing.

Recommended Product: Wet & Forget Stain Remover:

Wet & Forget moss, mold, mildew, and algae stain remover is a highly recommended product for cleaning decks. It is effective in removing various types of growth and is EPA certified for use around gardens and plants. 

Dilute concentrated formulas according to the manufacturer’s instructions before applying them to the deck.

Application Methods for Wet & Forget:

Different application methods for Wet & Forget include attachable hose spray bottles, pump-up sprayers, buckets and mops or brooms, or hand-held sprayers for small areas. 

Choose the appropriate method based on the size of your deck and the extent of the green growth.

Avoid Chlorine Bleach:

Chlorine bleach, although effective in removing mold and mildew on non-porous surfaces, is not recommended for wood decks due to its potential damage to the wood fibers and environmental concerns. It is best to explore safer alternatives.

Safer Alternatives: Oxygen Bleach and Hydrogen Peroxide:

Oxygen bleach is a safer alternative to chlorine bleach. It kills bacteria and fungus, is non-toxic and biodegradable, and can be combined with warm water, borax, and dish soap for deck cleaning. Scrub the mixture into the wood, let it sit, and rinse thoroughly. 

Hydrogen peroxide (3%) is another environmentally friendly option for cleaning mold and mildew. Mix it with water, spray it on the affected areas, let it sit, and wipe or rinse it off.

Removing Moss:

Concentrated hydrogen peroxide (25-30%) can be used to remove moss from wood decks. Apply it directly to the moss, let it work, and then scrape or pressure wash the moss off. 

Alternatively, baking soda mixed with warm water can be used as a mild abrasive to remove green mold from wood surfaces. Scrub the mixture into the wood and rinse with fresh water.

Using White Vinegar:

White vinegar, when mixed with water, is an acidic solution that can penetrate the wood and eliminate mold and mildew at their roots. Apply it with a spray bottle or watering can, scrub it in with a stiff-bristle brush, and rinse the wood thoroughly.

Homemade Cleaning Solutions:

There are several homemade deck cleaning solutions available, but not all are effective or environmentally safe. Vinegar, hydrogen peroxide, baking soda, and oxygen bleach are among the homemade options that can effectively kill mold and mildew. However, always exercise caution and follow proper dilution instructions.

Regular Cleaning and Maintenance:

Regular cleaning and maintenance of your wood deck will help prevent the growth of mold, mildew, algae, and moss, prolonging its lifespan and preserving its appearance. 

Promptly remove moss or thicker organic stains from the deck surface before applying any cleaning solutions.

Safety Precautions:

Always follow safety guidelines when using cleaning solutions, wear appropriate protective gear, and avoid contact with clothing and fabrics, especially when using hydrogen peroxide. 

Additionally, be mindful of the recommended distance from the deck surface when using a pressure washer to prevent damage.

Environmental Considerations:

EPA-approved products are available for effectively eliminating mold and mildew from decks. However, it is important to use them responsibly, avoiding application near water sources, rivers, or lakes. Protecting the environment should be a priority during the cleaning process.

Restoring the Wood’s Luster:

After removing moss and cleaning the deck, use a brightener to restore the wood’s luster and neutralize any remaining cleaning agents. This will help maintain the deck’s natural appearance and protect it from further damage.

Preventing Future Mold Growth on Wood

One of the most critical factors in preventing mold growth is controlling moisture levels. Moisture provides an ideal environment for mold to thrive. 

Monitor humidity levels in your home and ensure they remain below 60%. Use dehumidifiers in areas prone to moisture, such as basements or bathrooms, to maintain optimal humidity levels.

Good ventilation plays a crucial role in preventing mold growth. Ensure proper airflow throughout your home by opening windows, using exhaust fans in kitchens and bathrooms, and installing ventilation systems in enclosed spaces like attics and crawl spaces. 

Ventilation helps reduce moisture buildup and promotes drying of wood surfaces.

Promptly address any leaks or moisture intrusion issues in your home. Inspect plumbing fixtures regularly and repair any leaks immediately. Ensure proper sealing around windows, doors, and other potential entry points for water. 

By preventing water from seeping into your home, you minimize the risk of mold growth on wood surfaces.

Clogged or malfunctioning gutters and downspouts can cause water to overflow and accumulate near your home’s foundation, leading to moisture problems. 

Regularly clean gutters to prevent debris buildup and ensure proper water drainage away from your property. Install downspout extensions to direct water at least six feet away from your home’s foundation.

Sealing wood surfaces can provide an additional layer of protection against moisture and mold growth. 

Apply a high-quality wood sealant or paint to all exposed wood surfaces, including decks, fences, and outdoor furniture. Regularly inspect the sealant for any signs of wear or damage and reapply as needed.

Allow for adequate air circulation around wood surfaces, both indoors and outdoors. Avoid placing furniture or other items directly against walls or wooden structures. 

Leave space between stored items and walls to promote airflow and prevent moisture buildup.

Regular cleaning and maintenance are crucial for preventing mold growth on wood surfaces. Routinely inspect wood for any signs of moisture damage, discoloration, or mold growth. 

Clean wood surfaces using mild detergent and water, ensuring they are thoroughly dried afterward. Remove any debris or organic matter that can trap moisture and provide a breeding ground for mold.

A well-maintained roof is essential in preventing moisture infiltration and subsequent mold growth. Inspect your roof regularly for missing or damaged shingles, cracked flashing, or any signs of leaks. 

Address any roofing issues promptly and hire professionals for repairs or replacements when needed.

Proper landscaping and yard maintenance can contribute to mold prevention. Trim trees and shrubs near your home to allow sunlight to reach wooden surfaces and promote drying. 

Clear away leaves, debris, and vegetation from the vicinity of wooden structures. Maintain proper drainage in your yard to prevent water pooling.

Regularly monitor indoor humidity levels using a hygrometer. Keep humidity levels in check by utilizing dehumidifiers and air conditioners in humid climates or during humid seasons. 

Ensure proper ventilation in areas prone to high humidity, such as bathrooms and laundry rooms.

If you notice any signs of mold growth on wood surfaces, address the issue promptly. Remove the mold using appropriate cleaning techniques or seek professional assistance for extensive mold infestations. Identify and rectify the underlying cause of mold growth to prevent recurrence.

Stay informed about mold prevention techniques and best practices. Understand the conditions that favor mold growth on wood surfaces and implement preventive measures accordingly. 

Regularly update your knowledge on effective cleaning methods, appropriate sealants, and maintenance tips to ensure optimal mold prevention.


Green mold on wood decks is a common issue that requires immediate attention to prevent damage and health risks. 

By following proper cleaning techniques and using recommended products, you can effectively remove mold, mildew, algae, and moss from your deck. 

Regular maintenance and cleaning will help preserve the deck’s integrity and extend its lifespan, ensuring years of enjoyment in a clean and safe outdoor space.

Frequently Asked Questions (FAQs)

Can I use bleach to remove mold from painted wood surfaces?

Yes, bleach can be used on painted wood surfaces. However, it’s important to test the bleach solution on a small, inconspicuous area first to ensure it doesn’t cause any damage or discoloration. Additionally, take necessary precautions to protect yourself and the surrounding environment when using bleach.

Are there any natural alternatives to chemical cleaners for removing green mold from wood?

Yes, vinegar and borax are natural alternatives that can effectively remove green mold from wood. They are safer options compared to chemical cleaners and are readily available in most households.

Can green mold cause health problems?

Yes, green mold can cause health problems, particularly for individuals with respiratory conditions, allergies, or weakened immune systems. It’s important to remove mold promptly and take preventive measures to maintain a healthy living environment.

Can I prevent green mold on outdoor wooden surfaces, such as decks?

Yes, you can prevent green mold on outdoor wooden surfaces by regularly cleaning and sealing the wood. Ensure proper drainage and airflow, and remove any debris that can trap moisture. Consider using mold-resistant products for added protection.

What should I do if the mold infestation is extensive or persistent?

If the mold infestation is extensive or persistent, it’s advisable to seek professional assistance. Professional mold remediation experts have the necessary expertise and equipment to handle severe mold problems effectively.

Kristen Park - Specialised Content Writer for Caresh Fresh

My name is Kristen Park and I am a senior writer specialising in how-to guides and home cleaning information at Cares Fresh. As a researcher, I take pride in digging deep to find every small detail on a topic and explaining it in a way that is easy for the reader to understand.