How Often Should You Clean Your Windows?

Unger Enterprises Marketing | May 15, 2025

Did you know that National Clean Your Windows Day is observed every year on May 15? Recognized by the International Window Cleaning Association, it’s the perfect reminder for businesses to pause and take a closer look at their facility’s windows.

This national observance isn’t just about aesthetics — it’s about prioritizing maintenance, safety, and curb appeal. Clean windows don’t just brighten your space; they enhance visibility, improve natural light, and send a clear message that your facility is well cared for. Whether it serves as a fresh start or part of your regular maintenance routine, National Clean Your Windows Day is a great opportunity to reevaluate if your window cleaning schedule is as effective as it should be.

If you’re not sure how often you should be cleaning your windows, you’re not alone. Figuring out how often to clean your facility’s windows isn’t a one-size-fits-all situation by any means. The right answer depends on a handful of different factors: what kind of building you have, your local weather, and what’s going on in the area around your property.

General Cleaning Frequency by Building Type

 

Factors that Influence Window Cleaning Frequency

While no magic number works for every facility, we can help you think through the important factors that go into deciding how often you clean our windows.

#1 The Paneful Truth About First Impressions

Think about the last time you walked up to a restaurant or hotel and noticed streaky, dirty windows or a grimy awning.  Gives you pause, doesn’t it? It makes you wonder what the inside looks like — and not in a good way.

There’s a saying that you never get a second chance to make a first impression — and it applies to buildings, too. In fact, 55% of first impressions are based purely on what we see. That means your landscaping, signage, and yes — your windows — are helping people decide whether they want to do business with you.

When your business relies on walk ins — whether it’s a restaurant, hotel, retail store, etc. — your exterior is doing a lot of talking for you. Clean, shiny windows send a message: we care about the details, we take pride in our space, and we’re ready to serve.

In hospital or healthcare settings, keeping your indoor windows clean is about more than just first impressions. In these environments, window cleanliness is especially important to help maintain a sterile environment, prevent the spread of infections, and promote a sense of cleanliness and well-being for patients and staff.

#2 Weather or Not It’s Time to Clean Those Windows

Where your building is located plays a huge role in how often your exterior windows need attention. Different parts of the country come with their own unique weather, and some weather impacts windows more than others.

• Coastal Areas: Salt, Wind, and Grime
  If your facility is near the coast, you’re dealing with more than just sunshine. Salt from the ocean air settles on windows quickly, leaving a hazy, corrosive film. The salt accumulation can eat away at the glass and frames over time if you don’t clean it off regularly. In high-salt areas, it’s not unusual for businesses to schedule monthly cleanings, especially if you prioritize appearance and long-term maintenance.
• Rainy Regions: Water Spots and Streaks
  In wetter climates, such as the Pacific Northwest, the frequent rain might make you think you can skip window cleanings, but it’s actually the opposite. If the windows are dirty before it rains, the rainwater clings to the existing dirt, pollen or dust. Then when the rainwater dries, it leaves behind streaks and mineral deposits. In these areas, a quarterly cleaning schedule may be a good baseline.You can learn more about how rainwater (and tap water) contribute to window spots and streaking here.
• Dry and Dusty Zones: Desert Debris
  In desert climates, dust and sand are constant companions to a local business. Add in occasional high winds and you’ve got a recipe for dirty, gritty windows. The fine particles don’t just dull the shine, they can also scratch glass over time, especially if you try to wipe them away dry. In these climates, monthly cleanings are often needed.
• Four-Season Cities: Ever-Changing Weather
  In places that experience all four seasons, you may want to adjust your window cleaning schedule throughout the year to deal with springtime pollen, summer storms, fall leaves and sap, and winter’s snow, salt, and slush. Facilities that face multiple seasons should consider a seasonal cleaning routine with extra cleanings during high-traffic or bad-weather stretches.

#3  Location, Location, Location

Despite the weather forecast, your windows might still get dirty fast depending on what’s surrounding your facility. When you think of big cities, in general, you can think about higher levels of pollution, traffic and exhaust. If you’re in a dense urban area, consider monthly or bi-monthly cleanings to stay ahead of the buildup.

And if you’re in a high-rise building, there’s a bit of a silver lining: being above the fray generally means less exposure to ground-level grime. Upper floors often stay cleaner longer, so less frequent cleanings may suffice. Although don’t forget about ground-level windows, which still bear the brunt of everything from foot traffic to city soot.

The Clear Conclusion

At the end of the day, how often you clean your facility’s windows comes down to what you’re working with — your building type, your climate, and what’s going on around you. While there’s no universal rule of thumb, your goal should be keeping your windows clear, professional, and making the kind of first impression you want people to have. Keeping that in mind, whether it’s salt in the air, pollen from the trees, or traffic just outside your door, you’ll be able to take a closer look at your windows and know if you are staying on top of your outdoor window cleaning.

Key Takeaways: 

Buildings that Require Daily or Weekly Cleaning

• Retail Stores in Urban Environments
• Businesses by the Ocean/Salt Water
• Healthcare Facilities
• Restaurants

Buildings that Require Monthly or Bi-Monthly Cleaning

• Businesses in Desert Areas
• Businesses in high rain regions

Buildings that require Quarterly or Bi-Annual Cleaning

• High-rise Office Buildings (2nd floor and above, ground floor windows need more frequent cleaning)
• Rural/Suburban businesses

Start your window cleaning journey this May 15^th for National Clean Your Windows Day!