How to Wash Your Windows (and How Often)
Windows collect a slow film of dust, pollen, and hard-water spots that quietly dims every room in the house — and if it sits long enough, it etches the glass permanently. Washing your windows twice a year keeps them clear, protects a surprisingly expensive part of your home, and doubles as an inspection that catches failing seals and cracked caulk while they're still easy fixes.
Quick Answer
Wash exterior windows every 6 months — spring and fall are the classic rhythm — and interior windows once a year or whenever they look dull. Clean on an overcast day with warm water, a few drops of dish soap, and a squeegee to avoid streaks. Rinse the screens and wipe the tracks while you're there, and leave high or second-story windows to a pro with the right ladder and safety gear.
Recommended Maintenance Interval
Twice a year is the standard for exteriors — enough to strip pollen, dust, and hard-water deposits before they etch the glass, without turning your weekends into window duty. Homes near the ocean, busy roads, or heavy pollen may want quarterly washes; interiors mostly need attention once a year.
Exterior windows
Every 6 months (spring & fall)
Interior windows
Once a year, or as needed
Window screens
With each exterior cleaning
Window tracks & weep holes
Every 6 months
Window seals & weatherstripping check
Once a year
What a Window Wash Involves
- • Vacuuming sills, frames & tracks first
- • Washing glass with mild soapy water
- • Squeegeeing in overlapping strokes
- • Wiping frames, sills & weep holes
- • Rinsing & drying screens
- • Cleaning interior glass top to bottom
- • Buffing edges with a dry microfiber cloth
- • Inspecting seals, caulk & screens
Why Window Washing Matters
Clean windows are one of the cheapest upgrades your home can get — and one of the few chores where skipping it causes permanent, unrecoverable damage to what you're trying to protect.
Lets the Light Back In
A film of dust, pollen, and hard-water spots builds up so slowly you stop noticing it — until the windows are cleaned and the rooms look brighter instantly. Clean glass can let in noticeably more natural light, which makes the whole home feel larger and warmer without spending a dime on lighting.
Protects Your Windows from Damage
Hard water, pollen, and salt are mildly corrosive. Left on glass long enough, they etch permanent mineral spots that no cleaning can remove. A twice-a-year wash removes those deposits before they bond to the surface, protecting windows that cost hundreds of dollars each to replace.
Extends the Life of Frames and Seals
A proper wash is also an inspection: you'll catch cracked caulk, failing seals, clogged weep holes, and rotted wood frames while they're still cheap fixes. Foggy double-pane windows mean a broken seal — and catching it early matters for both your energy bill and your warranty.
Cuts Down on Dust and Allergens
Window sills and tracks are dust and pollen traps, and every time you open the window some of that blows back inside. Washing the glass, screens, and tracks a couple of times a year is a quiet but real win for allergy sufferers — right up there with swapping your HVAC filter.
Signs Your Windows Need a Wash
Window grime accumulates so gradually that most homes are a season or two overdue before anyone notices. A few of these cues mean it's time.
- 1Glass looks hazy or gray even on bright days
- 2Hard-water spots or mineral streaks that don't wipe off
- 3You can see dust films, fingerprints, or a rainbow sheen when light hits the glass
- 4Sunlight through the window shows dust floating indoors
- 5Window tracks are grimy or the screen looks dull and dusty
- 6It's been 6 months or more since the last exterior wash
- 7Pollen season just ended in your area
- 8Double-pane windows look foggy between the panes (a failed seal, not dirt)
- 9Caulk around frames is cracked, or you feel drafts near the window
- 10You're selling or hosting, and want the whole house to look its best
How to Wash Your Windows (Streak-Free)
The professionals' trick is simple: minimal soap, a squeegee, and no direct sunlight. Follow the steps in order — the dry prep work in the first two steps is what separates a clean window from a smeared one.
Pick an overcast day. Direct sun dries cleaning solution before you can wipe it, which is the #1 cause of streaks. A mild, cloudy day — no rain expected — is the sweet spot for perfect glass.
Dust and vacuum first. Sweep cobwebs and loose dirt from frames, sills, and tracks with a dry brush or vacuum crevice tool before anything gets wet — otherwise you'll make mud that streaks across your fresh glass.
Start with warm water and a small amount of dish soap. A few drops per bucket is plenty. Skip anything abrasive, and never use razor blades or scouring pads on tinted or coated glass.
Wash top to bottom with a soft sponge or microfiber cloth. Wet the whole pane, giving extra attention to bug spots and splatter near the sills.
Squeegee off the solution in overlapping strokes. Start at a top corner and pull across in an S-pattern, wiping the blade with a clean cloth between strokes. The squeegee is what separates professional-looking glass from streaked glass.
Wipe frames, sills, and tracks. These hold the dirt that matters most — old toothbrushes work well in tracks, and a quick rinse clears the weep holes at the bottom of the frame so rain can drain instead of pooling.
Rinse and dry the screens. If they're removable, hose them off gently with plain water and let them air-dry fully before reinstalling. Torn or sagging screens can often be re-screened for a fraction of the cost of new ones.
Do the interiors, top to bottom per room. Interior glass needs less scrubbing but picks up film from cooking, candles, and HVAC dust — a spray bottle with water and a drop of dish soap plus a squeegee handles most of it.
Buff the edges with a dry microfiber cloth. A quick pass along the frame line and corners removes the last droplets that dry into spots.
Inspect as you go, and note anything that needs a pro: fogged double panes, cracked caulk, rotted wood, or sticky windows that won't stay open. Then set a recurring reminder so the next wash lands on schedule — Home Reminders can handle that for you.
Safety tip: Never lean a ladder against glass, gutters, or gutter guards, and keep ladders away from power lines. If a window is above arm's reach from the ground, hire a professional rather than stretch or over-reach on a ladder — window washing injuries are among the most common ladder accidents at home.
Helpful Tips
A handful of habits separate windows that look professionally cleaned from ones that streak — and a few things you should never do to glass.
Work top to bottom on every window — solution drips down, and you'll just re-clean your own work if you go the other way.
Newspaper or a clean coffee filter makes a great final polish for interior glass, but a lint-free microfiber cloth does the same job without the ink risk.
For stubborn hard-water spots, try a 50/50 white vinegar and water soak first — and don't let it dry on the glass. If that doesn't lift it, the mineral has likely etched the pane and the spot may be permanent.
Skip the pressure washer on windows. High pressure forces water past seals and weatherstripping and can fog double-pane glass — a garden hose on the screens is as aggressive as you should get.
Wash screens and tracks, not just glass. Half of the visible dirt on a window is actually on the screen — clean glass behind a dirty screen still looks hazy.
Hire a pro for second-story or hard-to-reach windows. A single fall from a ladder can cost far more than a lifetime of professional window cleaning — reserve DIY for what you can safely reach from the ground.
Frequently Asked Questions
Want Home Reminders to remember this for you?
Add this item to your personalized home maintenance schedule. Build and review your complete schedule free — no account or credit card required.