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It is generally NOT recommended to use a high-pressure power washer on fiber cement siding.

Why You Should Be Cautious:

• Damage: High-pressure water can damage the surface finish of the siding, leading to erosion or a chalky appearance.
• Water Intrusion: High-pressure jets can force water behind the siding panels, which can lead to moisture damage and potential issues with the underlying structure or mold growth, especially if the caulking is old or damaged.
• Warranty: Using a high-pressure washer or improper cleaning methods may void the manufacturer’s warranty for your siding (e.g., James Hardie explicitly warns against high-pressure blasts).

How to Use a Pressure Washer Safely (If Absolutely Necessary):

If you feel a garden hose is insufficient and you must use a pressure washer, follow these precautions:

For best results and to maintain your siding, “soft washing” (low pressure combined with a safe cleaning solution) is the preferred alternative to high-pressure washing.

General Cleaning Tips

• Work Top to Bottom: Always start cleaning at the top of a section and work your way down to prevent streaks.
• Small Sections: Clean a small area at a time and rinse it thoroughly before moving to the next section.
• Go With the Grain: When scrubbing, move the brush or cloth in the direction of the plank (side-to-side for horizontal siding).
• Protect Surroundings: Wear safety gear and cover any landscaping or plants below the area you are cleaning.