How Do You Prevent Streaks When Cleaning Windows?

Few things are more frustrating than cleaning your windows only to step back and see streaks in the sunlight.

So how do you prevent streaks when cleaning windows?

Preventing streaks comes down to three key factors: purified water, proper technique, and the right equipment.

When all three are in place, windows dry clear and spotless.

Use Purified Water Instead of Tap Water

One of the biggest causes of streaking is mineral residue.

Tap water contains dissolved minerals like calcium and magnesium. When the water evaporates, those minerals are left behind — creating spots and streaks.

Professional window washing systems use purified water that has had minerals removed. Because it’s free of dissolved solids, it dries without leaving residue.

No minerals = no streaks.

Avoid Cleaning in Direct Sunlight

Heat is another common culprit.

When windows are cleaned in direct sunlight, water dries too quickly. Rapid evaporation can leave behind uneven drying marks and streaks.

Professional cleaners plan their work strategically, adjusting timing based on conditions.

Use the Proper Tools

The right tools make a major difference.

Professionals use:

• High-quality squeegees
• Clean, lint-free applicators
• Water-fed pole systems
• Purified water filtration systems

Dirty or worn tools are a common source of streaking.

Master the Technique

Technique matters just as much as equipment.

To prevent streaks, professionals:

• Apply even pressure with the squeegee
• Use smooth, controlled strokes
• Wipe edges clean
• Avoid overlapping improperly

Improper hand technique is often why DIY window cleaning leaves visible lines.

Keep Frames and Edges Clean

Residue along window frames and seals can drip down onto freshly cleaned glass, creating streaks after the fact.

Professional window washing includes cleaning around frames to prevent runoff from re-soiling the glass.

Why Professional Cleaning Produces Better Results

Even with the best intentions, DIY window cleaning often results in:

• Water spots
• Uneven drying
• Residue streaks
• Smearing

Professional systems — especially those using purified water — allow windows to dry naturally and spot-free.

Final Answer: How Do You Prevent Streaks When Cleaning Windows?

To prevent streaks, use purified water, avoid direct sunlight, use high-quality tools, and apply proper technique. Professional window washing combines all of these elements to deliver clear, streak-free results.

If you’re tired of streaks no matter what you try, it may be time to bring in the professionals.

Contact OFF THE WALL today to schedule expert window washing for your home or property.