ASCEND Composite Cladding is designed to provide the upscale appearance of painted wood with relatively low maintenance. In many cases, normal rainfall will remove light surface dirt. Areas protected by porches, roof overhangs, trees, or nearby structures may need occasional rinsing.

The mistake is assuming that a durable exterior cladding product should be cleaned with aggressive water pressure. High-pressure washing can damage the finish, force water into open or ventilated areas, and create a maintenance problem that may not qualify for warranty coverage.

Why Shouldn’t ASCEND Be Pressure Washed?

Pressure washers can deliver far more force than is needed to remove ordinary dirt from exterior cladding. That concentrated pressure may affect the surface finish or force water into seams, trim transitions, ventilation openings, and other areas of the wall system.

The ASCEND warranty specifically identifies power washing as a cause of damage or material failure that is not covered. That means a homeowner or contractor could be responsible for the repair if the product is damaged during pressure washing.

What Is the Best Way to Clean ASCEND?

The preferred cleaning method is intentionally simple. Start with clear water from a standard garden hose. For dirt that does not rinse away, use a soft-bristled, long-handled washing brush.

1. Inspect the cladding for loose accessories, damage, or open transitions.
2. Wet nearby landscaping and protect delicate plants when using a cleaning solution.
3. Rinse the surface gently with clear water from a garden hose.
4. Use a soft-bristled brush on areas with heavier dirt.
5. Work from the bottom of the wall toward the top to help reduce streaking.
6. Clean only a small area at a time.
7. Rinse the entire cleaned section thoroughly before the solution dries.

What Cleaning Solution Does ASCEND Recommend?

For hard-to-remove dirt such as soot or industrial grime, the manufacturer’s cleaning guide provides a specific cleaning mixture.

How Should Mildew Be Cleaned?

In areas where mildew is a concern, the manufacturer’s cleaning instructions allow the standard cleaning mixture to be modified by replacing one quart of the water with one quart of laundry bleach.

Protect landscaping, skin, and eyes when using bleach or any chemical cleaning agent. Never mix bleach with ammonia or an ammoniated cleaner, because that combination can produce dangerous fumes.

What Cleaners Should Be Avoided?

ASCEND should not be cleaned with aggressive chemicals or abrasive tools. These products can damage the finish, create uneven gloss, or lead to a condition that is excluded from warranty protection.

• Abrasive powders or cleaners containing abrasive particles
• Solvents
• Ammoniated cleaning products
• Paint removers
• Brick wash
• Acids or salts
• Scouring pads or stiff wire brushes
• Unapproved concentrated chemicals

Should You Scrub ASCEND Composite Cladding?

Light brushing is acceptable, but vigorous scrubbing should be avoided. The manufacturer warns that aggressive rubbing may create glossy areas over the cladding’s finish.

Use the softest method that removes the dirt. More force is not necessarily more effective, and excessive scrubbing can leave the cleaned area looking different from the surrounding surface.

What Is the Best Weather for Cleaning ASCEND?

For the best results, clean ASCEND on a cool, overcast day when temperatures are approximately 55°F to 75°F. Hot sun can cause a cleaning solution to dry too quickly, leaving streaks or residue behind.

• Choose a cool or overcast day.
• Avoid cleaning extremely hot cladding.
• Work on small sections at a time.
• Allow the cleaning solution to remain wet for at least three minutes.
• Rinse the section with clear water before it dries.

Can a Contractor Use a Low-Pressure Soft-Wash System?

Contractors should be cautious about describing any powered cleaning system as approved unless they have written authorization from the manufacturer. The published warranty excludes damage from power washing, while the cleaning guide specifically directs users toward a garden hose and soft-bristled brush.

A low-pressure chemical application may still create warranty or finish concerns if the chemicals, concentration, dwell time, rinsing pressure, or application method fall outside the manufacturer’s instructions. When there is any doubt, obtain written direction from ASCEND before proceeding.

Does Pressure Washing Automatically Void the Entire Warranty?

The written warranty states that damage or material failure caused by power washing is not covered. That does not necessarily mean every unrelated portion of the warranty automatically disappears, but it does mean the manufacturer can exclude a claim when power washing caused or contributed to the damage.

The safe position is straightforward: do not pressure wash ASCEND Composite Cladding. Follow the manufacturer’s published care instructions and keep records of any professional cleaning performed.

Why Contractors Should Explain Cleaning Requirements

Contractors should explain proper care at the completion of every ASCEND installation. A homeowner who assumes all exterior siding can be pressure washed may unintentionally damage the finish and create a warranty dispute years later.

Providing the homeowner with the official cleaning guide, warranty information, product records, and installer contact information creates a better customer experience and protects everyone involved in the project.

The Bottom Line

ASCEND Composite Cladding should not be pressure washed. The manufacturer excludes damage caused by power washing from warranty coverage and recommends cleaning the cladding with clear water from a garden hose, a soft-bristled brush, and an approved cleaning solution when necessary.

Keep the process gentle, avoid harsh chemicals, rinse thoroughly, and follow the published care instructions. The goal is not simply to make the cladding clean today—it is to preserve the finish and product performance for years.