How to Clean Exterior Windows Like a Pro

To clean exterior windows without streaks: wash on an overcast day, use a squeegee instead of paper towels, work top to bottom, and dry the frame edges before the water evaporates on its own. The whole job takes about 10 minutes per average-sized window once you have the right tools and a system.

Most streaking, spotting, and "why does this still look dirty" frustration comes down to two mistakes: cleaning in direct sun and skipping the squeegee. Fix those two things and everything else is just repetition.

What You Need Before You Start

You don't need much. A bucket, a scrubber, a squeegee, and a couple of microfiber cloths handle almost every home.

• A soft-bristle scrubber or wash mitt on an extension pole
• A squeegee with a rubber blade in good shape (cracked or hardened rubber leaves lines)
• A bucket of warm water with a few drops of dish soap, not window cleaner
• Two microfiber cloths, one for edges and one for the squeegee blade between passes
• An extension pole if your windows are above ground floor

Skip the vinegar-and-newspaper method you might have seen online. It works in a pinch, but it's slower and leaves more lint behind than a squeegee does. Dish soap and water is what professional window cleaners actually use, according to the International Window Cleaning Association, because it cuts grime without leaving a residue.

Step 1: Pick the Right Weather

Wash on a cloudy day or in early morning shade. Direct sunlight heats the glass and dries your cleaning solution before you can squeegee it off, which is what causes streaks in the first place. Wind is also a problem: it dries the water unevenly and blows debris back onto wet glass. Calm, overcast conditions are the sweet spot.

Step 2: Clear the Frame and Sill First

Dust, cobwebs, and dead insects collect in the corners of the frame and along the sill. Brush or vacuum this out before you introduce water. If you skip this step, that debris turns into mud the moment it gets wet, and you'll end up scrubbing it across the glass instead of cleaning it off.

Step 3: Wash the Glass

Dip your scrubber or mitt in the soapy water and work the glass in overlapping strokes, starting at the top corner. Don't rush this part. The scrubbing is what actually loosens dirt, pollen, and hard water spots. The squeegee just removes the water afterward.

For windows with heavy mineral buildup from sprinklers or hard water, a mix of water and white vinegar can help break down the deposits before you scrub. Let it sit for a minute or two first.

Step 4: Squeegee Top to Bottom

This is the step most DIYers skip, and it's the one that matters most.

Starting at the top corner, pull the squeegee across in one smooth horizontal stroke, slightly overlapping each pass as you move down the glass. Wipe the blade clean with a microfiber cloth after every stroke. A dirty blade just redistributes the grime you worked to remove.

If you're working on tall windows and can't reach the top corner without stretching, use a straight top-to-bottom stroke down the center first to create a dry starting channel, then squeegee horizontally from there.

Step 5: Detail the Edges

Water tends to pool at the corners and along the frame no matter how careful you are. Wipe these edges with a dry microfiber cloth immediately after squeegeeing so they don't drip down and streak the glass you just cleaned.

Common Mistakes That Cause Streaks

Most streaking traces back to one of these:

Using paper towels or old newspaper instead of a squeegee. Both leave fibers or ink residue on glass.

Cleaning in full sun, which dries the solution before you can remove it properly.

Reusing a dirty cloth on the squeegee blade, which just smears dirt in a thin, even layer across the glass.

Skipping the frame and sill cleaning, so debris ends up on the glass mid-wash.

Safety Notes for Second-Story and Higher Windows

An extension pole with a scrubber and squeegee attachment reaches most second-story windows from the ground safely. If you need a ladder, follow basic ladder safety: keep three points of contact, don't lean the ladder against the glass itself, and never stand on the top rung. The Ladder Association's safety guidance is a good reference if you're unfamiliar with proper ladder setup.

For anything above a standard two-story home, or windows you genuinely can't reach safely from the ground or a stable ladder, that's the point where it makes more sense to bring in a window cleaning crew with the right equipment rather than risk a fall over a clean pane.

How Often Should You Clean Exterior Windows

Twice a year is the baseline for most homes: once in spring after pollen season and once in fall before winter storms roll in. Homes near busy roads, construction, or the ocean collect grime faster and may need a wash every three to four months to stay clear.

FAQ

Do I need special window cleaner, or does soap and water work? Plain dish soap and water works as well as most commercial window cleaners for exterior glass. Commercial cleaners are convenient but not necessary. The technique (squeegee, overcast day, dry edges) matters more than the product.

Why do my windows look streaky even after I clean them? The most common cause is cleaning in direct sunlight, which dries the water before you can squeegee it off evenly. A dirty squeegee blade or reused cloth is the second most common cause.

Can I use a pressure washer on windows? Not directly on the glass. Pressure washers can crack seals, force water behind trim, or even break older glass. They're better suited to siding, driveways, and decks. If your window frames or surrounding trim need attention too, that's a separate job from the glass itself.

How long does it take to clean exterior windows on an average house? Budget about 10 minutes per window once you have your tools set up, so a typical home with 10 to 15 windows takes an hour to an hour and a half.

Is it worth hiring a professional instead of doing it myself? For ground-floor and easily accessible second-story windows, DIY works fine if you have an afternoon and the right tools. For homes with tall windows, skylights, or hard-to-reach angles, professional cleaning saves time and removes the fall risk entirely.