Hey there! I'm a supplier of glass windows, and I've seen my fair share of dirty commercial building windows. Cleaning these windows isn't just about making a place look good; it's also about maintaining the integrity of the glass and ensuring a clear view. In this blog, I'll walk you through the steps to clean a glass window in a commercial building like a pro.
Step 1: Gather Your Supplies
Before you start cleaning, you'll need to gather the right supplies. Here's what you'll need:
- A good-quality glass cleaner: There are tons of glass cleaners on the market. I recommend choosing one that's specifically designed for commercial use. It should be able to cut through dirt, grime, and even stubborn stains.
- Microfiber cloths: These are a must-have. They're soft, absorbent, and won't leave lint on the glass. You'll need a few clean cloths for the job.
- Squeegee: A squeegee is essential for getting a streak-free finish. Make sure it's the right size for the windows you're cleaning.
- Ladder or scaffolding: Depending on the height of the windows, you might need a ladder or scaffolding to reach them safely.
- Bucket: You'll need a bucket to hold your cleaning solution.
- Gloves: Protect your hands from the cleaning solution and any sharp edges on the window frames.
Step 2: Prepare the Cleaning Solution
You can either use a store-bought glass cleaner or make your own. If you want to make your own, here's a simple recipe:
- Mix 1 part white vinegar with 3 parts water in a bucket.
- Add a few drops of dish soap to help break down grease and dirt.
Stir the solution well until it's thoroughly mixed.
Step 3: Protect the Surroundings
Before you start cleaning, it's important to protect the surrounding area. Cover any furniture, plants, or equipment near the windows with plastic sheets or drop cloths to prevent them from getting wet or damaged.
Step 4: Remove Loose Dirt and Debris
Use a soft brush or a dry microfiber cloth to gently remove any loose dirt, dust, or cobwebs from the window and the frame. This will prevent the dirt from scratching the glass when you start cleaning.
Step 5: Apply the Cleaning Solution
Dip a microfiber cloth or a sponge into the cleaning solution and wring it out well. You don't want it to be dripping wet. Start at the top of the window and work your way down, applying the solution in a circular motion. Make sure to cover the entire surface of the glass, including the edges and corners.
If you're using a squeegee, you can also apply the solution directly to the glass using a spray bottle. Spray the solution evenly across the window, starting from the top.


Step 6: Clean the Window Frame
While the cleaning solution is still on the glass, take a clean microfiber cloth and use it to clean the window frame. Wipe away any dirt, grime, or fingerprints from the frame. Pay special attention to the corners and crevices where dirt tends to accumulate.
Step 7: Use the Squeegee
Once you've applied the cleaning solution, it's time to use the squeegee. Start at the top of the window and hold the squeegee at a 45-degree angle. Pull the squeegee down in a straight line, applying even pressure. Wipe the blade of the squeegee with a clean microfiber cloth after each pass to prevent streaks.
Work your way across the window in horizontal or vertical passes, overlapping each pass slightly to ensure that you cover the entire surface. Make sure to clean the edges of the window with the squeegee as well.
Step 8: Dry the Edges
After you've used the squeegee, there may be some water left along the edges of the window. Use a clean microfiber cloth to dry the edges and corners of the window. This will prevent water spots from forming.
Step 9: Check for Streaks
Once you've dried the edges, take a step back and check the window for streaks. If you see any streaks, go back and re-clean the affected area using a clean microfiber cloth and a small amount of cleaning solution.
Step 10: Clean the Other Side
If the window is double-sided, repeat the above steps on the other side of the window. Make sure to clean both sides thoroughly to ensure a clear view.
Special Considerations for Different Types of Windows
Double Casement Windows
If you're dealing with Double Casement Windows, there are a few extra things to keep in mind. These windows have two sashes that open like doors, so you'll need to clean both the inside and outside of each sash.
When cleaning the hinges and hardware of double casement windows, use a soft brush or a cotton swab to remove any dirt or debris. You can also use a small amount of lubricant to keep the hinges working smoothly.
Tinted Windows
Tinted windows require special care to avoid damaging the tint. When cleaning tinted windows, use a mild glass cleaner that's specifically formulated for tinted glass. Avoid using abrasive cleaners or scrubbers, as these can scratch the tint.
Large Windows
Cleaning large windows can be a challenging task. If you're dealing with large windows, it may be helpful to use a long-handled squeegee or a telescopic pole to reach the top of the window. You can also enlist the help of a friend or colleague to make the job easier.
Conclusion
Cleaning a glass window in a commercial building doesn't have to be a difficult task. By following these steps and using the right supplies, you can clean your windows like a pro and keep them looking their best.
If you're in the market for new glass windows for your commercial building, I'd love to help. As a glass window supplier, I have a wide range of high-quality windows to choose from, including Double Casement Windows. Whether you're looking for energy-efficient windows, soundproof windows, or windows with a specific design, I can help you find the perfect solution for your needs.
Contact me today to learn more about my products and services, and let's start a conversation about your window needs.
References
- "How to Clean Windows Like a Pro." The Spruce.
- "Cleaning Commercial Windows: A Step-by-Step Guide." Window Cleaning Resource.




