Streak-Free Window Cleaning: Method & Tips

Clean windows make a home feel brighter, but there are few cleaning jobs as frustrating as wiping a window and then seeing streaks the moment the sun hits it. The good news is that streak-free window cleaning is mostly about technique, not expensive products. With the right tools and a simple method, you can get clear glass every time. This guide covers the tools, the step-by-step method, frames, tracks and flyscreens, and the mistakes that cause streaks. It also covers safety, because windows are one of the easiest places to get hurt while cleaning.

Why Windows Streak

Streaks are usually caused by one of these: • Too much cleaning product, which dries on the glass as a film. • Dirty water or cloths, which spread grime instead of removing it. • Cleaning in direct sunlight, which dries the solution before you can remove it. • The wrong cloth, such as paper towel that leaves lint, or a cloth with fabric softener residue. • Hard water leaving mineral spots as it dries. • Not removing all the liquid, so drips dry into marks. Fix those, and most streaks disappear.

Tools for Streak-Free Glass

• A squeegee. A good-quality squeegee with a sharp, clean rubber blade is the single biggest upgrade for larger windows and sliding doors. • A strip washer or soft sponge to apply the cleaning solution. • Microfibre cloths. Use one for washing and a separate, dry, lint-free microfibre cloth (a glass cloth or waffle-weave cloth works well) for detailing edges. • A bucket of warm water. • A cleaning solution. Warm water with a few drops of dishwashing liquid works on most windows. A commercial glass cleaner is fine for small panes, mirrors and touch-ups. • A soft brush or vacuum attachment for tracks and frames. • A stable step ladder, if needed, used on level ground. Wash microfibre cloths without fabric softener. Softener leaves a coating that causes smears.

Step-by-Step: Streak-Free Window Cleaning

1. Pick the right time

Clean on an overcast day, or when the window is in shade. Direct sun dries the solution too fast and leaves marks.

2. Dust and vacuum first

Brush or vacuum cobwebs, dust and dead insects from the frame, sill and track before you wet anything. Otherwise you'll turn dust into mud.

3. Wash the glass

Dip the strip washer or sponge in your solution and squeeze out the excess. Wash the glass thoroughly, paying attention to corners and edges where grime builds up.

4. Squeegee

Wipe a dry strip along the top edge of the glass with your cloth so the squeegee has a clean starting point. Then pull the squeegee down or across in overlapping strokes, keeping a consistent angle and pressure. Wipe the blade with a damp cloth after every stroke. On large windows, many people use a side-to-side "S" pattern to keep water moving in one direction.

5. Detail the edges

Use a dry microfibre cloth to wipe the edges and corners where water collects, and to remove any drips from the sill.

6. Check from an angle

Look at the window from different angles and in different light. Touch up small marks with a dry microfibre cloth rather than re-wetting the whole pane.

Cleaning Small Panes, Mirrors and Glass Doors

For small panes, mirrors, shower screens and glass doors, a squeegee may be overkill. 1. Spray a light mist of glass cleaner onto the cloth, not directly onto the glass. That avoids drips and overspray. 2. Wipe in one direction, then buff dry with a second clean microfibre cloth. 3. Change to a fresh cloth as soon as the first one starts to feel damp. Glass doors at children's and pets' height get the most marks, so a quick wipe once or twice a week keeps them clear.

Frames, Tracks and Sills

Clean glass doesn't look great surrounded by dirty frames.

Tracks

1. Vacuum loose dirt with a crevice tool. 2. Spray with a little warm soapy water, and loosen grime with an old toothbrush or a narrow brush. 3. Wipe out with a cloth wrapped around a flat tool, such as a butter knife, to reach into the corners. 4. Dry the track. Window and sliding door tracks are one of the areas property managers often check at the end of a lease. Our end of lease cleaning service includes them.

Frames and sills

Wipe with a damp microfibre cloth and mild detergent, then dry. On timber frames, use as little water as possible.

Flyscreens

1. Remove the screen if it's designed to come out, and note which window it came from. 2. Brush or vacuum both sides gently. 3. Wash with warm soapy water and a soft brush, then rinse gently. Avoid high pressure, which can stretch or tear the mesh. 4. Let it dry fully before refitting.

Outside Windows and Safety

Cleaning the outside of windows is where most of the risk is. • Stay on the ground where you can. Use an extension pole with a squeegee or strip washer for upper ground-floor windows. • Use ladders safely. Set them on firm, level ground, maintain three points of contact, and don't overreach. Have someone with you. • Never lean out of upstairs windows or stand on balcony railings to reach glass. • Check for hazards, including power lines, wasps' nests and slippery surfaces. • Leave high windows to professionals who have the right equipment and training for working at height.

Common Mistakes

• Cleaning in direct sunlight. • Using too much product or soap. • Using paper towel or newspaper, which can leave lint or ink. • Using cloths washed with fabric softener. • Not wiping the squeegee blade between strokes. • Forgetting the frame and tracks. • Using abrasive pads that scratch the glass or tinting. If your windows have tinting or special coatings, check the manufacturer's care instructions before cleaning. Some products can damage window film.

How Often Should You Clean Windows?

• Inside: every few months, plus spot cleaning of marks on doors and low windows. • Outside: a couple of times a year for most homes, more often near busy roads, the coast or construction. • Tracks and screens: when you clean the glass. • Before moving out or selling: always.

Professional Window Cleaning

If you'd rather not deal with ladders and squeegees, our house cleaning service can include internal windows, tracks and sills as part of a regular or one-off clean. If you're moving out, internal windows and tracks are covered in our bond cleaning checklist. And if you're preparing for moving day, see our move-in cleaning checklist.

Frequently Asked Questions

What is the best homemade window cleaner?

Warm water with a few drops of dishwashing liquid works well for most windows when used with a squeegee. Use only a small amount of detergent, because too much causes streaks.

Why do my windows streak after cleaning?

Usually because of too much product, cleaning in sunlight, dirty water or cloths, or leaving liquid to dry on the glass. A clean squeegee blade and a dry microfibre cloth for edges fixes most streaks.

Is newspaper good for cleaning windows?

It was a popular trick, but modern newsprint can leave ink and lint. A lint-free microfibre cloth is a better choice.

Can I clean tinted windows with glass cleaner?

Check the tint manufacturer's instructions. Many recommend avoiding ammonia-based products and abrasive pads on window film.

Clear Windows Without the Effort

Contact iCleanPro to add windows, tracks and sills to your next clean. Related guide: Retail Shop Cleaning: Keeping a Store Customer-Ready Related guide: How to Clean Blinds: Venetian, Roller and Vertical

Streak-Free Window Cleaning: Tools, Method and Common Mistakes