Introduction

Security glass is a critical feature in environments that demand heightened protection—banks, government buildings, commercial entrances, luxury homes, and even vehicles. Its strength and resilience provide defence against impact, forced entry, and ballistic threats. However, these benefits come with a trade-off: security glass requires a different approach to maintenance, particularly when it comes to cleaning.

Unlike standard glazing, security glass is composed of intricate layers, often combining polycarbonate and laminated glass with specialised coatings. These surfaces are not only more sensitive but also more susceptible to permanent damage if treated incorrectly. For anyone involved in professional window cleaning, facilities management, or property maintenance, it’s essential to understand how to clean this unique material properly.

This article delves into what sets security glass apart, outlines the tools and techniques required for safe maintenance, highlights common pitfalls to avoid, and offers expert advice on long-term care. Whether you’re a cleaner, technician, or property owner, this comprehensive guide will help you maintain clarity and performance without compromising the material’s integrity.

Cleaning Security Glass: What Makes It Different?

1. Understanding the Composition

Security glass isn’t a single sheet of thickened material. Instead, it’s made by laminating several layers of glass and polycarbonate (or polyvinyl butyral, PVB) under controlled pressure and heat. The result is a reinforced pane that distributes and absorbs energy on impact.

Depending on the level of security required, the external surface might be either polycarbonate or glass, each with its own vulnerabilities. Many systems include additional surface treatments like anti-spall coatings or scratch-resistant films. These features can be highly sensitive to aggressive cleaning agents or abrasives.

Key takeaway: Treating security glazing like regular glass can lead to irreversible damage, clouding, or delamination.

2. Surface Sensitivity

Security glazing may include:

• Polycarbonate outer layers that scratch easily
• Anti-abrasion coatings that wear down under friction
• UV-blocking or anti-spall films that degrade with chemical exposure

Using ammonia-based cleaners, alcohols, or scouring pads can dull the surface, cause hazing, or strip protective layers. Once compromised, the only remedy may be expensive replacement.

3. Structural Integrity Considerations

Cleaning isn’t just a cosmetic task—it’s a matter of preservation. The laminated structure of security glass relies on a strong bond between its layers. Harsh cleaning methods can weaken these bonds over time, particularly around the edges where moisture and chemicals can infiltrate.

Delamination, once it begins, spreads gradually and undermines the protective performance of the glazing. Not only does this reduce optical clarity, but it also compromises impact resistance, defeating the glass’s intended function.

4. Approved Cleaning Agents

To clean security glass safely, use only:

• pH-neutral, non-abrasive soaps
• Distilled water to avoid mineral deposits
• Microfibre cloths or soft sponges
• Manufacturer-approved glass cleaners for laminated or polycarbonate surfaces

Avoid:

• Any cleaner containing ammonia, alcohol, or strong solvents
• Paper towels, which can be abrasive
• High-pressure hoses or washers directly aimed at glass edges

Always refer to the glass manufacturer’s cleaning instructions when available. What works for one type of security glass may not be suitable for another.

5. Proper Cleaning Techniques

Follow these expert steps:

Step 1: Dust Removal

Gently wipe the surface with a dry microfibre cloth to remove dust and particles. This prevents micro-scratches during wet cleaning.

Step 2: Apply Cleaning Solution

Spray a diluted cleaning solution onto a soft cloth—never directly onto the glass—and apply gently in small sections.

Step 3: Gentle Wipe-Down

Using a circular or overlapping motion, clean from top to bottom. Do not apply force or scrub vigorously.

Step 4: Immediate Drying

Dry the surface promptly with a clean, dry cloth. This prevents streaks and avoids letting moisture collect around the edges.

Important tip:

Always clean out of direct sunlight, as heat can dry the solution too quickly and leave visible marks.

6. Long-Term Maintenance Tips

To prolong the life and clarity of your security glass:

• Clean regularly: Routine light cleaning is safer and more effective than occasional deep scrubbing.
• Inspect frequently: Check for signs of delamination, scratching, or hazing.
• Protect the edges: Ensure sealants and frames remain in good condition to prevent moisture ingress.
• Train your team: All cleaning personnel should be informed of the unique handling and cleaning needs of security glazing.

Routine care, when done correctly, helps maintain the performance and appearance of security glass for many years.

FAQs (Frequently Asked Questions)

Q1: Can I use standard household window cleaners on security glass?

No. Most off-the-shelf glass cleaners contain ammonia or alcohol, which can degrade coatings and polycarbonate layers. Always use pH-neutral, manufacturer-approved products.

Q2: What if the surface gets scratched?

Minor scratches may not affect function but can impair visibility. Deeper scratches may weaken protective layers. Some polycarbonate surfaces can be polished, but always consult the manufacturer first.

Q3: How often should security glass be cleaned?

This depends on environmental conditions. High-traffic or urban settings may require weekly cleaning, while quieter indoor areas may only need attention monthly.

Q4: Is pressure washing safe for security windows?

No. High-pressure washing can drive water into the edges, causing delamination. Stick to low-pressure, manual cleaning techniques.

Q5: Do coatings like anti-glare or anti-fog require special care?

Yes. These surface treatments are sensitive to chemicals and abrasion. Use only soft cloths and approved cleaners to avoid removing or damaging them.

Q6: Is there a difference between cleaning polycarbonate-faced security glass and glass-faced versions?

Yes. Polycarbonate is softer and scratches more easily. It’s also more sensitive to chemical exposure. Always determine the outermost layer and adapt your cleaning approach accordingly.

Conclusion

Cleaning security glass is a specialised task requiring knowledge, precision, and the right tools. These materials are designed to resist force, not careless maintenance. Whether you’re responsible for high-security installations or maintaining glazed doors in a commercial property, treating this glass correctly ensures that it retains both its clarity and structural integrity.

Avoid harsh chemicals, stick to approved cleaning agents, use the proper techniques, and always dry the surface thoroughly. Regular inspections and proper staff training also go a long way in preventing avoidable damage.

With the right approach, security glass can deliver protection and aesthetics for years to come—without compromising its critical performance.

Trust professionals with experience in cleaning specialised glass systems. Whether you’re maintaining a high-rise office or a secure residential space, London Window Cleaners is ready to help. Contact us online or call (44) 20 3954 2900 / (44) 7983 444 210 to schedule your expert cleaning service today.