Quick answer: Twice a year, spring and fall, is the standard professional window cleaning schedule for most Western Washington homes. Homes near a main road, under heavy tree cover, next to lake water, or with sprinklers hitting the glass often need it more. The reason not to stretch the schedule indefinitely: surface mineral buildup is cleanable, but hard water left on glass long enough etches it, and etching is permanent damage that cleaning can’t undo.
The baseline: spring and fall
Two cleanings a year map onto how this climate actually treats glass. Winter leaves months of rain-dried mineral spotting and grime; a spring cleaning clears it and lets the summer light in. By fall, pollen season and summer dust have done their work, and a fall cleaning gets the glass clear before the low, gray months when every bit of light through the window matters.
That’s the schedule for a typical home. The interesting question is what moves a specific home off it.
What makes a home need more
- A main road nearby. Traffic film is real: exhaust and road dust build a haze on exterior glass faster than anything else in a residential setting.
- Heavy tree cover. Fir and maple don’t just drop debris in gutters. Pollen, sap points, and organic dust settle on glass and screens under a canopy.
- Sprinklers that hit the windows. Irrigation water is the most common source of hard water spotting on ground-floor panes, and it re-applies with every cycle.
- Lake exposure. Waterfront and near-lake homes (Kirkland’s a good example in our service area) get more humidity and reflected light, which shows up as more mineral spotting than the same house would collect further inland.
The reason not to wait: buildup versus etching
This is the distinction that matters more than any schedule. Mineral deposits sitting on the surface of the glass are a cleaning problem: a proper cleaning takes them off. But hard water left on glass long enough works into the surface and etches it. At that point it’s not dirt anymore, it’s damage, and no amount of standard cleaning brings the glass back.
An honest window cleaner tells you which one you’re looking at before recommending anything, because the answers are different: surface buildup gets cleaned, light etching sometimes responds to a separate restorative treatment, and deep etching is a glass replacement conversation. If someone quotes you a standard cleaning for etched glass without mentioning the difference, they either didn’t look or didn’t want to say.
Don’t forget the skylights
Skylights sit flat or angled, collect debris in a way vertical glass doesn’t, and live in a spot that isn’t safe to reach with a household ladder. That combination makes them the most skipped glass on the house, and often the glass that needs attention most. Exterior grime cuts the light coming into the room, and film on the inside clouds it further. If your home has skylights, put them on the same schedule as the rest of the windows and make sure whoever you hire actually includes them. Ours are covered on the Residential Window Cleaning page.
Inside glass counts too
A window only looks clean when it’s clear from both sides. Interior glass mostly collects dust and a faint haze you don’t notice until low afternoon sun hits it, which in this region is exactly the light you get for half the year. A professional cleaning that skips the interior side is half a job.
What it costs
Residential window cleaning for a standard Eastside home, interior and exterior, typically runs $150 to $350 in this market, with skylights quoted separately. Full local pricing for every service is on our Pricing page.
When you’re ready, request a free estimate or call (206) 228-5069, and tell us roughly how many windows and whether the home has skylights so the quote lands accurately.
