How To Clean James Hardie Siding

How To Clean James Hardie Siding

Fiber cement siding, such as James Hardie siding, is a popular choice for homeowners due to its durability, weather resistance, and low maintenance requirements. However, to keep it looking its best and prolong its life, regular cleaning is essential. In this article, we will guide you through the steps of effectively cleaning James Hardie fiber cement siding, ensuring it remains in excellent condition for years to come.

Advantages of James Hardie Siding

James Hardie Siding
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James Hardie siding offers several advantages over other siding materials. It is specifically engineered to withstand harsh weather conditions, making it an ideal choice for homes in regions with extreme temperatures, heavy rain, or high humidity. Additionally, James Hardie siding comes in a wide range of colors and textures, allowing homeowners to achieve the desired look for their property.

Prepare Yourself for Cleaning

Before beginning the cleaning process, it is crucial to take some necessary precautions and gather the right tools.

Safety Precautions

Safety should always be the top priority when cleaning any part of your home. Before starting, ensure you have a sturdy ladder and someone to assist you during the cleaning process, especially if you need to reach higher areas. Always wear appropriate protective gear, such as safety goggles and gloves, to avoid injury.

Gather The Necessary Tools And Equipment

To clean James Hardie fiber cement siding effectively, you’ll need the following tools:

  • Soft-bristled brush or sponge
  • Bucket
  • Garden hose
  • Non-abrasive cleaner or homemade solution

Choosing the Right Cleaning Solution

Using the proper cleaning solution is crucial to prevent damage to the siding. Avoid harsh chemicals or abrasive cleaners, which can erode the surface and void the warranty. Instead, opt for mild, non-toxic cleaners that are safe for the siding and the environment.

Safety Reminders When Cleaning Your James Hardie Siding

Wear Protective Gear

Always wear safety goggles, gloves, and appropriate clothing to protect yourself from potential hazards during the cleaning process.

Handle Chemicals Carefully

If you encounter hazardous substances like lead-based paint or asbestos, avoid cleaning them yourself. Contact a professional who specializes in handling such materials. Also, be mindful of the cleaning solution you chose. Certain chemicals can irritate your eyes or skin if not handled properly. 

Ladder Safety

When using a ladder, ensure it is stable and placed on a level surface. Have someone hold the ladder while you work to prevent accidents.

Steps to Carefully Clean Your James Hardie Siding

Depending on the level of dirt and grime on your James Hardie siding, you can use various cleaning methods.

Clearing Dust and Debris

Begin by removing loose dust and debris from the siding. Use a soft-bristled brush or a dry sponge to gently sweep away dirt, spider webs, and loose particles. This step will make the washing process more effective.

Hand Washing with a Soft Brush Brush

Fill a bucket with a mixture of warm water and your chosen non-abrasive cleaner. Gently scrub the siding in a circular motion and work on small sections to ensure a thorough cleaning.

Remove Stains and Mildew

Over time, James Hardie’s siding may develop stains and mildew. Here are some tips on how to tackle these issues effectively.

Identify Common Stains

Stains on the siding can be caused by various factors, such as dirt, rust, paint, or hard water. Identifying the type of stain will help you choose the appropriate cleaning method.

Safe and Effective Stain Removal Techniques

For common stains, use a mixture of water and mild detergent to spot-clean the affected areas. For more stubborn stains, try using a vinegar solution or a specialized cleaning product designed for fiber cement siding.

Maintenance Tips for Longevity

Maintaining your James Hardie siding regularly will extend its lifespan and keep it looking pristine.

Regular Inspections

Perform routine inspections to check for signs of damage, cracks, or loose boards. Addressing these issues promptly will prevent further damage and ensure the siding’s longevity.

Repainting and Caulking

If you notice peeling paint or caulk, it’s essential to repair the affected areas. Properly maintained paint and caulk provide an additional layer of protection against moisture and pests.

Also, check out our blog post: How long does James Hardie siding last? 

Preventive Measures for Future Cleaning

To minimize the need for frequent cleaning, consider implementing preventive measures such as installing gutters and downspouts to direct water away from the siding. Trimming trees and bushes near the siding can also reduce the amount of debris and dust that accumulate on the surface.

Common Mistakes to Avoid

Steer clear of these common mistakes to prevent damage and maintain the integrity of your James Hardie siding.

Harsh Chemicals and Abrasive Tools

Using strong chemicals and abrasive tools can cause irreversible damage to the siding’s finish. Stick to mild, eco-friendly cleaners and soft brushes for safe and effective cleaning.

Pressure Washer Usage

Using a pressure washer can lead to water intrusion behind the siding or even chip the paint. It is never recommended to use a pressure washer on your siding, it is best to stick with a garden hose and soft bristle brushes for a complete clean that won’t do any damage. 

Ignoring Mold and Mildew

Mold and mildew growth not only affects the siding’s appearance but can also lead to structural issues. Address mold and mildew promptly using appropriate cleaning methods.

Eco-Friendly Cleaning Alternatives

For environmentally conscious homeowners, there are eco-friendly cleaning solutions that are just as effective as commercial cleaners.

Homemade Cleaning Solutions

Create a simple and effective homemade cleaning solution using common household ingredients like vinegar, baking soda, or lemon juice. These natural alternatives are safe for both your siding and the environment.

Climate Conscious Cleaners

Look for commercial cleaners labeled as eco-friendly or biodegradable. These products are formulated to be gentle on the environment while effectively cleaning your James Hardie siding.

When to Hire Professionals

Consider hiring professionals for extensive cleaning, removing mold and mildew infestations, or dealing with hazardous substances. If you plan to call a professional, compare the cost of hiring workers versus doing the cleaning yourself, and factor in the time, effort, and potential risks involved.


Regularly cleaning and maintaining your James Hardie fiber cement siding will preserve its beauty and performance for years. By following the proper cleaning methods and avoiding common mistakes, you can ensure your siding continues to enhance your home’s aesthetics and protect it from the elements.

Hire A James Hardie Siding Contractor In New Jersey

If you’re cleaning your siding, and begin to notice damage, it’s time to call in the professionals. If you live in New Jersey, contact the team at Champion Exteriors. Our team has extensive experience installing, repairing, and replacing siding, and as a James Hardie certified siding contractor, we’re who you want to trust. Call us today at (609) 845-3576 for any assistance with James Hardie siding repair, or installation.