Why You Shouldn’t Clean Windows on Sunny Days

Blue skies might look like the perfect backdrop for window cleaning… but they’re actually the worst conditions for the job. If you want streak-free, crystal-clear glass, sunny days are the one time you should avoid reaching for the spray bottle.

Here’s why.

☀️ 1. The Sun Dries Cleaner Too Quickly

When direct sunlight heats up your windows, your cleaning solution evaporates almost instantly.
That means no time to wipe properly—and a lot of streaks left behind.

💧 2. Streaks Become Inevitable

If the cleaner dries before you’ve had a chance to work it in, the dirt doesn’t lift. Instead, it gets baked onto the glass, leaving cloudy patches and lines that are even more noticeable in the sunlight.

🧽 3. Smudges Get More Stubborn

Warm glass makes existing fingerprints, smears, and marks cling on for dear life. You’ll end up using more effort (and more cleaner) for a worse result.

🌥️ The Best Time to Clean Windows

Choose a cool, overcast day.
Cloudy conditions keep the glass cool, giving your cleaner time to work properly and helping you achieve a smooth, streak-free finish.

✅ Pro Tip

Clean one window at a time using a microfibre cloth or squeegee.
Work from top to bottom, and finish by wiping the edges to avoid drips sneaking back onto the glass.

If your business, facility, or commercial windows need professional attention—especially high access or water-fed pole cleaning—the O’Shea team is always ready to help, with care, consistency, and a sparkling finish every time.