Oxidation Removal on Exterior Buildings: What You Need to Know

If you’ve ever noticed your vinyl siding looking dull, chalky, or faded—especially on the sunniest side of your building—you’re likely dealing with oxidation. This common issue affects many types of exterior surfaces, particularly vinyl siding, aluminum siding, and metal trim. Sun exposure, rain, wind, and pollution all contribute to the slow breakdown of protective coatings and color vibrancy.

But what exactly is oxidation? How do you remove it effectively without damaging your exterior surfaces? And—perhaps most importantly—how do you prevent it from returning? Let’s break it all down.

What is Oxidation?

Oxidation is a chemical reaction that occurs when UV rays from the sun break down the outer layer of siding or other exterior materials. Over time, this degradation creates a faded, powdery, or chalky film on the surface. It's particularly noticeable on darker-colored siding, where color loss is more visually apparent.

How to Identify Oxidation:

• Rub your hand across the siding. If you’re left with a white, dusty residue, you’re dealing with oxidation.

  
  

• Check for uneven color, patchy dullness, or streaking, especially on sun-exposed areas.

  
  

• The surface may feel dry, rough, or degraded compared to unaffected sections.

  
  

Best Cleaning Solutions for Oxidation Removal

While many hardware stores carry general-purpose cleaners, effective oxidation removal requires professional-grade cleaning agents that are carefully chosen based on surface type, oxidation level, and environmental factors. These solutions are not only stronger and more effective but also require trained handling to avoid damaging siding or surrounding areas.

Here are some of the top cleaners used by professional exterior cleaning companies:

✅ Cleansol BC by EaCo Chem

• Type: Alkaline-based, non-corrosive oxidation remover

  
  

• Usage: Ideal for use on vinyl, painted surfaces, aluminum, and metal facades

  
  

• Why pros use it: It effectively breaks down heavy oxidation while being safe on most surfaces when properly applied. Requires knowledge of dwell time and dilution ratios for best results.

  
  

✅ Pro Cleanse BC

• Type: Multi-surface alkaline cleaner

  
  

• Applications: Used on vinyl siding, stucco, EIFS, and other painted exteriors

  
  

• Professional benefit: Versatile and powerful, especially for properties with mixed material exteriors. Professionals can adjust concentration levels based on surface sensitivity and severity of buildup.

  
  

✅ Custom Blends and Additives

• Many experienced contractors also use custom-mixed solutions or additives tailored to the job, combining degreasers, surfactants, and oxidation removers to maximize cleaning efficiency.

  
  

• These blends are not available in retail stores and require technical expertise for safe handling and application.

  
  

Note: These products are often hazardous in untrained hands. Professionals are equipped with the correct PPE (personal protective equipment), sprayers, and rinse systems to ensure effective and safe application.

Why These Products Are Best Left to the Pros

• Strong chemical formulations can cause etching or discoloration if misused.

  
  

• Precise application techniques ensure oxidation is removed evenly without further damaging the surface.

  
  

• Professionals understand the chemistry, including how to neutralize and rinse safely, especially around delicate landscaping or painted areas.

  
  

How Professionals Safely Remove Oxidation from Exterior Surfaces

While light surface cleaning can be done by homeowners, oxidation removal is best handled by trained professionals—especially when dealing with large areas, multi-story buildings, or heavy oxidation. Professionals use specialized cleaning agents and proven techniques that restore siding without causing damage.

Here’s what a typical professional oxidation removal process looks like:

1. Initial Assessment

• A technician inspects the property to assess the severity of oxidation, surface type, and environmental conditions.

  
  

• This step helps determine the most appropriate cleaner, application method, and protective measures.

  
  

2. Surface Preparation

• Technicians will lightly rinse the building to remove surface dirt, dust, and debris.

  
  

• If mold, mildew, or algae is present, a pre-treatment using sodium hypochlorite or other targeted cleaners may be applied.

  
  

• Sensitive areas—like electrical fixtures, outlets, windows, and landscaping—are covered and protected.

  
  

3. Application of Oxidation Remover

• The chosen professional-grade solution (e.g., Cleansol BC or Pro Cleanse BC) is applied using low-pressure sprayers to ensure even coverage.

  
  

• Trained crews use soft-bristle brushes or microfiber pads to agitate the oxidized layer without scratching or scarring the siding.

  
  

4. Controlled Rinse

• Professionals use low-pressure rinsing techniques to safely remove residue without damaging the surface.

  
  

• High-pressure washing is avoided entirely, as it can worsen the oxidation or permanently damage vinyl and painted materials.

  
  

5. Post-Clean Inspection

• After cleaning, the technician will inspect the area to ensure all oxidation has been removed evenly.

  
  

• In some cases, a protective conditioner or sealant may be applied to prolong the life of the siding and prevent future oxidation.

  
  

Why hire a professional? They bring the expertise, safety equipment, and commercial-grade products that are often unavailable to homeowners. This reduces risk, ensures better results, and often saves time and money in the long run.

Preventing Oxidation on Your Building's Exterior

Oxidation is easier to prevent than to fix. Here’s how to stay ahead of the buildup:

• Annual Maintenance: Rinse your siding once or twice a year to remove contaminants and prevent surface breakdown.

  
  

• Apply a Protective Coating: Some professional-grade conditioners or vinyl restoration products can help prolong surface integrity.

  
  

• Trim Vegetation: Overhanging branches can trap moisture, which accelerates surface wear and mildew growth.

  
  

• Inspect Regularly: Watch for early signs of oxidation and address them before they worsen.

Cost of Professional Oxidation Removal

If you’re located in Manitoba or other Canadian provinces, hiring a professional service can provide more consistent results, especially for larger properties.

• Average Cost: $0.50 to $1.00 per square foot

  
  

• Factors Affecting Price:

  
  

  • Extent of oxidation: Heavier buildup may require more aggressive treatments and multiple passes.

    
    

  • Building size: Larger square footage generally reduces the cost per square foot due to scaling.

    
    

  • Surface material: Different materials (vinyl, aluminum, stucco) may need specialized cleaning products.

    
    

  • Accessibility: Multi-story buildings or areas requiring scaffolding or lifts may increase the final quote.

    
    

For example, a 2,000-square-foot exterior with moderate oxidation could cost between $350 and $750, prices may vary depending on the difficulty or the full scope of the job.

Final Thoughts

Oxidation is a natural result of weather exposure, but it doesn’t have to ruin your building’s curb appeal or reduce its lifespan. Whether you're a homeowner, property manager, or professional contractor, knowing how to identify, treat, and prevent oxidation will keep your exterior looking fresh and well-maintained.

With the right cleaners, proper technique, and consistent maintenance, you can restore your siding’s appearance and protect your investment for years to come.

This is part of a soft washing process—learn more about the earlier steps in our previous blog post Understanding Soft Washing: A Gentle Approach to Exterior Cleaning.