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How to Clean Siding Without Damaging It

Power washing old paint off a house exterior, revealing a clean surface beneath.
Power washing old paint off a house exterior, revealing a clean surface beneath.

Over time, all types of siding—whether wood, vinyl, or fiber cement—can accumulate dirt, grime, and even mildew. While this buildup might make your siding look like it needs painting, often all it takes is a good cleaning to restore its original look. Here’s how to clean siding effectively and safely.

Why Pressure Washing Isn’t Always the Best Choice

Many professionals use pressure washers, but this can be too aggressive for siding. The high-pressure spray can:

  • Damage caulk or seams, leading to leaks and water intrusion.
  • Push water underneath the siding, potentially causing mold or rot.

There are other, less harsh methods to clean siding effectively.

A worker power washing a white wall, creating a misty spray.
A worker power washing a white wall, creating a misty spray.

Step-by-Step Guide to Cleaning Siding

  1. Prepare Your Cleaning Solution:

    • Mix a mild detergent (like dish soap) with warm water.
    • Use a garden sprayer to easily apply the solution to the siding.

  2. Wet the Siding:

    • Begin by thoroughly wetting the surface with clear water. This helps loosen dirt and prevents streaking.

  3. Scrub with a Soft Brush:

    • Use a soft car-washing brush attached to a long pole to scrub the siding.
    • Work from the bottom up to avoid streaks from dirty water dripping onto dry sections below.

  4. Rinse Thoroughly:

    • Rinse each cleaned section with clear water immediately after scrubbing. Start at the top and work down, making sure all soap is removed.
A worker diligently cleans the exterior of a building with a long-handled brush.
A worker diligently cleans the exterior of a building with a long-handled brush.

How to Tackle Mildew and Tough Stains

If your siding has gray, black, or green spots, chances are it’s mildew. To remove it:

  1. Use a Mildew Cleaner:

    • A product like JOMAX is specifically designed to remove mildew.
    • Follow the label directions:
      • Spray the product on the affected areas.
      • Wait for the recommended time (usually a few minutes).
      • Rinse thoroughly with clean water.

  2. Scrub Stubborn Spots:

    • For more difficult mildew or dirt, lightly scrub the area using the soft brush.
Cleaning the exterior of a house with a brush.
Cleaning the exterior of a house with a brush.

Pro Tips for Best Results

  • Work in Sections: Clean small areas at a time to prevent soap or dirt from drying before rinsing.
  • Avoid Direct Sunlight: Clean siding in the shade or on an overcast day to prevent detergent from drying too quickly.
  • Test First: Before cleaning the entire surface, test your detergent solution or mildew remover on a small, inconspicuous area.
Cleaning the house siding with a hose and a scrub brush.
Cleaning the house siding with a hose and a scrub brush.

Summary for Cleaning Siding

Securing the water supply with a protective cover on an outdoor tap.
Securing the water supply with a protective cover on an outdoor tap.
  1. Stick to mild detergent, water, and a soft brush. A pressure washer is an option as well.
  2. Work from the bottom up and rinse thoroughly to avoid streaking.
  3. Use products like JOMAX to effectively remove mildew and tough stains.
  4. Routine cleaning can make your siding look like new and help maintain your home’s exterior for years to come.

 

With a little time and effort, your siding will be spotless and refreshed, no painting required!