How to Clean Windows Streak Free: A Pro Method for Home and Office

The difference between amateur and professional window cleaning is the squeegee. Sprays and paper towels leave streaks, lint and missed spots no matter how careful you are. A professional moves a squeegee across the glass in one continuous motion and walks away with crystal clear windows. The technique is straightforward — once you know it.

The pro tools

• 10 to 18 inch squeegee with a quality rubber blade
• T bar washer / scrubber with a microfiber sleeve
• Bucket wide enough for the T bar
• Lint free huck towels or microfiber for edges
• Razor scraper for paint, putty or adhesive (use carefully on tempered glass)
• Detail brush for window tracks and frames
• Water fed pole for high or hard to reach exterior glass

Browse our window cleaning collection for a full kit.

The pro solution

A few drops of dish soap in a bucket of water is the classic. Modern window cleaning concentrates work better — they include surfactants for sheeting and squeegee glide aids that help the rubber slide cleanly. Avoid ammonia in occupied spaces.

For very dirty exterior glass, add a tablespoon of automotive windshield washer fluid for cold weather work or extra grease cutting.

Step by step

1. Prep the glass

Remove obvious debris, paint or putty with the razor scraper. Use it wet — never scrape dry glass. Brush window tracks clean of dirt before any wet work to prevent muddy runoff.

2. Wash with the T bar

Dip the T bar in solution, squeeze out heavy excess, then scrub the entire window in even strokes — corner to corner, edge to edge. Get into all four corners. The goal is to lift dirt off the glass, not just spread water around.

3. Squeegee technique

Tilt the squeegee at 30 to 45 degrees so only the leading edge touches the glass. Start at the top corner. Pull straight across in one continuous stroke, ending at the opposite corner. Wipe the squeegee blade with a clean towel after each stroke.

For the next stroke, slightly overlap the previous stroke. Continue down the window in horizontal strokes.

4. Detail the edges

The squeegee leaves a thin water line along the edges and at the bottom. Wipe these with a dry lint free huck towel in a clean motion. Never use the same towel that picked up dirt — it will redeposit it.

5. Inspect from an angle

Step back and check the glass from a 45 degree angle. Streaks and missed spots show up in raking light. Touch up with a microfiber and a clean spray.

The S-method for tall windows

For windows wider than your squeegee, use a continuous S motion: top right corner, across to top left, down a few inches, across to right, down again, across to left. The squeegee never leaves the glass. End at the bottom left or right. Wipe edges with a huck towel.

Exterior windows

Same technique. Add water fed pole for high windows. Modern water fed pole systems use deionized water that dries spot free with no squeegee — ideal for storefronts and ground floor commercial.

For 2nd story and up residential, professional cleaners use rope access or extension poles. Ladders for windows above 8 feet are an OSHA risk and should be avoided where possible.

Window tracks and frames

The window itself is only half the job. Tracks collect dirt that the squeegee cannot reach. Vacuum loose debris first, then scrub with a detail brush and the same solution. Wipe the frames with microfiber. Lubricate the track at the end with a silicone spray for smooth operation.

Common mistakes

Cleaning in direct sun. The solution dries before you can squeegee, leaving spots. Work shaded sides first or wait for cloudy weather.

Old squeegee blade. A nicked or dried out rubber blade leaves streaks no matter the technique. Replace blades every 1 to 3 months for daily use, immediately if damaged.

Dirty water. Change the bucket when it gets gray. Dirty solution redeposits soil.

Pressing too hard. Light pressure with the squeegee gives the cleanest result. Pressing hard distorts the blade and leaves lines.

Hard water spots

Mineral spots from sprinklers or rain runoff need a separate treatment. CLR or a similar mild acid descaler removes them. Apply, dwell briefly, rinse thoroughly. Test on a small area first — some glass coatings are sensitive to acid. After removal, apply a glass sealer or hydrophobic coating to prevent return.

Pricing for residential window cleaning

Average pricing in 2026:

• Inside and outside, 1 story: $5 to $10 per pane
• Inside and outside, 2 story: $7 to $12 per pane
• Add for screens, sills and tracks: 30 to 50 percent
• Storefront commercial: $1 to $3 per pane on regular schedule

Frequently asked questions

What is the best window cleaning solution?

For most work, a few drops of dish soap in warm water beats commercial sprays. For hard water spots, use a dedicated descaler. For commercial work, a window cleaning concentrate gives consistent results.

How often should I clean my windows?

Residential exterior: 2 to 4 times per year. Interior: 4 to 6 times per year. Commercial storefront: weekly to monthly depending on traffic and weather.

Can I use newspaper to clean windows?

It works because newspaper is lint free. But modern microfiber works better and does not leave ink residue on frames or hands. Browse our window cleaning supplies for the right kit.