Why Do Windows Get Scratched? And Can It Happen to Any Window?

Don't let scratched windows ruin your day.

If you've ever noticed fine lines or deep gouges in your window glass, you're not alone. Scratched windows are a common issue—especially for homeowners with older windows or those who've recently gone through a renovation. But why do windows get scratched in the first place? And is any window immune to damage?

Let’s break it down.

What Causes Window Scratches?

1. Improper Cleaning Tools

   One of the most common causes of scratched glass is using abrasive tools like steel wool, razor blades, or harsh scrubbing pads. Even paper towels can carry small particles that act like sandpaper. Cleaning glass seems simple, but the wrong tool can do permanent damage.

   
   

2. Construction Debris

   Post-construction cleaning is notoriously risky. Tiny bits of cement, paint, or drywall dust can become abrasive when dragged across the glass. A study by the International Window Cleaning Association (IWCA) found that construction debris is a leading cause of scratched windows—especially when standard razors or scrapers are used incorrectly during cleanup.

   
   

3. Hard Water Stains and Mineral Buildup

   Over time, minerals from hard water can bond to the glass surface. If these deposits are scrubbed off without softening them first (like with a specialized cleaner or acid wash), they can drag across the glass and leave scratches behind.

   
   

4. Environmental Factors

   Sand, tree branches, and even wind-blown debris can scuff up exterior windows over time—especially in dry, windy climates like California. The effect is gradual but noticeable.

   
   

5. Pets and Kids

   Curious paws and sticky fingers can do more than leave prints. Pets scratching at glass doors and kids dragging toys across windows can leave marks—especially on tempered or coated glass.

   
   

Can All Windows Get Scratched?

In short: yes, all glass can scratch. But some are more prone than others.

• Tempered Glass: Stronger than regular glass, but still scratchable—especially during post-construction cleanup.

• Low-E Coated Glass: These energy-efficient windows often have a delicate coating on the inside pane that’s even easier to damage if cleaned incorrectly.

  
  

• Laminated Glass: Common in hurricane-prone areas, this type of glass includes a plastic layer. While it’s more resistant to shattering, it can still get surface scratches.

  
  

• Annealed (Standard) Glass: The most vulnerable to scratches, especially if not maintained properly.

  
  

No glass is completely scratch-proof. Even Gorilla Glass (used in smartphones) isn’t immune.

The key is prevention and proper maintenance.

How to Prevent Window Scratches

• Use microfiber cloths and non-abrasive cleaners.

• Avoid cleaning windows with dry rags—always wet the surface first.

• Never use razors unless you’re trained or have a specialized scraper.

• Hire professionals for post-construction cleanup or hard water removal.

  
  

Final Thoughts

Scratches in your windows don’t just hurt your view—they lower curb appeal and can be costly to fix. Knowing what causes them is half the battle. Whether you’re a homeowner or a business owner, handling your glass surfaces with care and cleaning them properly can save you a lot of money and frustration.

Have scratched windows? Let Big City Window Cleaners take a look. We know the right tools, the right techniques, and how to protect your windows for the long haul.