3 Common Glass-Cleaning Mistakes You’re Probably Making, According to an Expert

The Mistake: Cleaning Warm Glass or in Direct Sunlight

When you clean windows in direct sunlight or when the glass is too hot, the cleaning solution will evaporate quickly, often before you have time to wipe it off properly. This rapid evaporation can cause the cleaner to dry in place, leaving behind streaks, water spots, or visible swirls. (Even high-quality cleaners can’t work effectively if they don’t stay on the surface long enough to lift dirt and dissolve grime.)

The Solution: Use a Squeegee

If you don't want to wait until dark to clean your windows (relatable), just invest in a squeegee. This inexpensive cleaning tool allows you to remove the cleaning solution swiftly before it has a chance to evaporate, regardless of sunlight or surface temperature.

Dragging the liquid off the glass in smooth strokes will remove the cleaner and loosen dirt, leaving a clean, dry surface behind. This will minimize streaks and help maintain a spotless finish—even in less-than-ideal conditions. "I never tackle windows without a squeegee on hand," shares Phillips. "The extra effort pays off."

The Mistake: Using Dirty or Linty Cleaning Cloths

Using paper towels, cotton rags, or other standard household cloths may seem convenient, but they can leave behind lint or fibers. Some materials also push dirt around rather than gripping and removing it.

Plus, if the cloth is damp or dirty from previous use, it can deposit residue back onto the glass. No matter how well you clean, you likely won't be able to get a spotless shine with the incorrect or dirty cleaning cloth.

The Solution: Use Clean, Dry Microfiber Cloths

Microfiber cloths are specifically designed to trap dirt, absorb liquids, and polish surfaces without leaving lint behind. Their fine fibers are much more effective at grabbing tiny particles and wicking away moisture, and they won't scratch delicate surfaces like glass. “I buy microfiber cloths by the dozens whenever I see them on sale or for cheap," says Phillips.

The Mistake: Using Tap Water

If you're making your own natural cleaners, avoid using tap water, especially if you live in an area with hard water. Minerals like calcium and magnesium may be in your tap water, which can remain on glass surfaces after the water evaporates in the form of cloudy spots or faint streaks.

The Solution: Use Distilled Water In Homemade Solutions

Pre-made commercial solutions are formulated with purified water and ingredients that minimize streaking and buildup, giving you a consistently clear finish. If you prefer to mix your own, choose distilled water which has had all minerals and impurities removed. This makes it ideal for mixing with vinegar or glass cleaner concentrate. No residue will be left behind after cleaning. 

For clients who prefer natural cleaning products, Phillips uses the following recipe: "I put 2 cups of distilled water, 1/2 cup of vinegar, and 1/4 cup of rubbing alcohol in a spray bottle and use it like I would any other cleaner," she shares.