7 Best Ways to Clean Outside Windows Streak-Free
The
best way to clean outside windows is to start by rinsing off loose dirt with a garden hose, then scrub the glass with a solution of warm water and mild dish soap or a vinegar-water mix using a sponge or soft brush. Once the grime is lifted, rinse thoroughly and dry the surface with a squeegee, finishing with a microfiber cloth for a crystal-clear shine. For the best results, clean on an overcast day so the cleaning solution doesn’t dry too fast, preventing streaks and residue marks.
1. Prepare the Outside Windows for Cleaning
Before any cleaning solution touches the glass, preparation ensures an easier and safer job. Begin by closing windows securely and removing screens if possible. Clear away garden furniture, pot plants, or debris near the frames to create room to work.
Next, rinse the windows with a garden hose using a gentle spray to remove grit, cobwebs, and sand. This prevents dirt from turning to mud during washing. Inspect the sills and corners for buildup or signs of mould, and gently brush them out before moving on. Preparation saves time later and helps the solution penetrate evenly.
2. Mix an Effective Window Cleaning Solution
A balanced cleaning mix helps lift grime without streaks or residue. Fill a bucket with warm water and add a small squirt of dishwashing liquid — or, for an eco-friendly option, mix equal parts white vinegar and water.
Vinegar naturally cuts through mineral buildup, while dish soap breaks down grease. Avoid overusing detergent; too many suds can leave visible streaks once dry. If windows have stubborn water stains, add a few drops of rubbing alcohol or methylated spirits to the mix for quicker evaporation. Keep the solution nearby for re-dipping as you clean.
3. Wash the Glass from Top to Bottom
Once your cleaning solution is ready, use a soft washer pad, sponge, or microfiber cloth to wash the glass. Dip it in the bucket and squeeze lightly so it’s wet but not dripping. Clean from top to bottom in overlapping passes, ensuring full coverage.
Outdoor glass tends to collect grime near window frames and seals — pay extra attention to these areas. If cleaning upper-storey windows, attach the washer to a telescopic pole for reach. Keeping the glass wet throughout prevents streaks and gives the squeegee a smooth glide in the next step.
Tools like telescopic poles, squeegees, and microfiber pads are essential. For a detailed look at Pro Tools, check out our guide to
window cleaning equipment that helps you clean faster and safer.
4. Scrub Away Tough Spots and Stains
Even with the best cleaning solution, some marks need a little extra effort. Common outdoor issues include bird droppings, tree sap, or hard water spots. Use a non-scratch sponge or pad to gently scrub problem areas. For hardened residue, apply vinegar directly to the spot and let it sit for a minute before wiping.
If using a scraper, make sure the blade is new and wet the glass thoroughly first. Scrape in one consistent direction to prevent scratches. Once stains are removed, rewash the entire pane so all areas are evenly clean and ready for drying.
5. Squeegee the Outside Windows
This step is key to streak-free results. Place your squeegee at the top corner of the glass and pull it across in one smooth motion, angling slightly downward to guide water off the surface. After each pass, wipe the rubber blade with a clean, dry cloth to avoid dragging dirt.
Work down the window in overlapping rows or an “S” pattern for larger panes. If the cleaning solution begins to dry, mist the glass with a bit of water before continuing. The squeegee ensures the glass dries evenly, leaving a professional finish without marks.
6. Detail the Frames, Edges, and Sills
After squeegeeing, detail work makes the finish look professional. Use a dry microfiber cloth to wipe around window edges and corners to remove stray drips. Clean the window sills and frames thoroughly, as this is where dirt collects most.
If you notice leftover streaks or haze, buff them out gently with a second dry microfiber cloth. For outdoor aluminium or uPVC frames, avoid abrasive pads — a damp cloth with mild detergent is enough to lift grime without damaging the finish. This detailing step gives windows their final polish and prevents new dust buildup.
7. Clean Upper-Storey Windows Safely
Cleaning upstairs windows requires both proper tools and caution. A telescopic pole fitted with a washer and squeegee can safely reach up to two storeys. For larger or harder-to-reach areas, consider a water-fed pole system, which delivers purified water through a brush head — rinsing and drying the glass without detergent.

Avoid standing on unstable ladders or stretching beyond reach, as this increases the risk of accidents. If the exterior glass is high-rise or access is limited, it’s best to hire professionals who use rope access or elevated platforms. Clean windows are important, but safety always comes first.
Eco-Friendly Way to Clean Outside Windows
Using sustainable cleaning products helps protect the environment while still achieving clear glass. A mix of vinegar, warm water, and a few drops of plant-based dish liquid is effective on dirt, pollen, and grease.
Microfiber cloths replace disposable paper towels, reducing waste. Avoid chemical-heavy cleaners that run off into soil or drains. Regular eco cleaning — especially after rain or coastal winds — prevents buildup, so heavy scrubbing becomes unnecessary later. Homes near beaches benefit from monthly maintenance to remove salt residue before it etches into the glass.
FAQs About the Best Way to Clean Outside Windows
Before diving into specific answers, it’s important to note that most outdoor window problems come down to three factors: timing, method, and product choice. These FAQs address the most common homeowner questions about cleaning frequency, sunlight conditions, and stain prevention.
How often should outside windows be cleaned?
In most Australian homes, cleaning exterior windows every three to four months maintains clarity and prevents grime buildup. Homes near beaches benefit from monthly maintenance to remove salt residue before it etches into the glass — especially those part of retail sites or locations already receiving commercial cleaning services.
What is the best time of day to clean outside windows?
The best time to clean windows is during cooler, overcast conditions — usually early morning or late afternoon. Avoid direct sunlight, as it causes water and detergent to dry too quickly, leading to streaks. Shade allows more working time for scrubbing, rinsing, and squeegeeing before the surface dries.
Can outside windows be cleaned without a ladder?
Yes. Using a telescopic pole with an attached washer or squeegee lets you clean second-storey windows from the ground safely. Water-fed poles are ideal for taller structures, providing consistent pressure and spot-free rinsing. Always ensure the pole is lightweight and securely locked before extending.
What solution removes hard water stains effectively?
Hard water stains result from mineral deposits. Mix equal parts vinegar and warm water to soften the buildup, then scrub with a non-scratch pad. For tougher cases, apply a commercial glass descaler designed for outdoor use, followed by a rinse with clean water. Prevent future stains by redirecting sprinklers away from glass surfaces.
Final Conclusion
The best way to clean outside windows is to follow a simple, professional sequence: rinse, wash, scrub, squeegee, detail, and dry. Using the right tools and gentle cleaning solutions helps glass stay spotless for months.
Whether maintaining a Sydney home, a coastal apartment, or a commercial building, clean windows instantly lift curb appeal and protect glass from permanent damage. For streak-free results and expert maintenance, Everyday Clean’s professional window cleaning services deliver a bright, polished finish every time.
Author: Everyday Clean Content Team
Everyday Clean is Sydney’s trusted provider of commercial and residential cleaning services. Our licensed professionals use eco-friendly, compliant methods to deliver spotless results across offices, schools, gyms, and homes.
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