Most of what people call dirty glass is three different problems with three different fixes, and one of them permanently etches the pane if you leave it long enough.
When somebody says their windows are dirty they usually mean one of three things, and the three are not versions of each other.
Pollen, dust, road grit, rain spotting, handprints, and the general haze that builds on any outdoor surface. This is what window cleaning removes, and it comes off easily and completely.
White or cloudy rings and streaks that do not move when you wash them. These are minerals left behind when hard water evaporated on the pane. They need an acidic product and mechanical work, not more cleaning solution.
Deposits that sat long enough, in enough sun, to chemically eat into the surface of the pane. The glass is now physically pitted. No product removes this. The pane has to be polished, which is specialist work, or replaced.
The reason this matters is that the middle one becomes the last one if you leave it. Mineral spotting on a south or west-facing window is a clock, not a cosmetic issue, and it runs faster in a Carolina summer than most people expect.
Almost always an irrigation head. A sprinkler that clips the bottom eighteen inches of a window three mornings a week is spraying mineral-bearing water onto hot glass and letting it dry there, over and over, on a schedule. That is the single most common cause of etched residential glass in the Triangle and Johnston County and it is entirely preventable by turning the head a few degrees.
If the spotting has a hard top edge at roughly the same height on several windows, that is a sprinkler pattern, not weather. Fixing the head is worth more than any number of cleanings.
Not because the glass breaks, though tempered panes can. Because of the seals. A modern window is two panes with a sealed gas gap and a perimeter seal, set in a frame with its own gaskets. Pressure finds those joints. Water behind the perimeter seal fogs the unit permanently from the inside, and there is no cleaning that, only replacing.
Screens are worse. A pressure washer stretches the mesh out of the frame and it never sits flat again. Screens come out, get washed flat and rinsed, and go back.
So window cleaning is hand work, or a water-fed pole with filtered water for anything above reach. The pole matters more than it sounds: it uses deionized water, which dries without leaving the minerals that caused the problem in the first place.
| Property | Interval | What drives it |
|---|---|---|
| House, exterior only | Twice a year | Once after pollen finishes in late spring, once after fall leaf drop. |
| House, inside and out | Once or twice a year | Interior glass gets cooking film and handprints rather than weather, so it runs on a different clock. |
| House under heavy tree cover | Three times a year | Sap, pollen, and organic film all arrive faster. |
| Storefront and retail entry | Monthly to quarterly | Foot traffic and handprints at hand height. This is the glass a customer judges the business by. |
| Office and medical entry | Quarterly | Lower traffic, but a smudged entry in a medical office reads worse than it does anywhere else. |
| Restaurant frontage | Monthly | Grease carries in the air and settles on glass. It is the one commercial case where the film is genuinely different. |
| Car dealership showroom | Monthly | The glass is the product display, and dealership showrooms are mostly glass. |
Cleaning the glass and leaving the screens and the frames. A clean pane behind a screen full of pollen still looks gray, and a clean pane in a track full of grit picks the grit straight back up the next time it rains. A proper job is glass, screens, frames, sills, and tracks, and the difference is visible from inside the room, which is where you actually look at windows.
The other one is timing it against the rest of the work. Glass goes after the house wash, never before. Washing siding above clean windows puts the runoff straight down the pane.
On a storefront the cleaning interval is a marketing decision rather than a maintenance one. The entry glass and the door handles are what a customer reads in the three seconds before they walk in, and they are the cheapest surface on the property to keep right.
We run monthly and quarterly glass for shopping centers, restaurants, office parks, and gyms across Clayton, Garner, Raleigh, and Cary, usually bundled with the entry concrete so the whole approach to the door gets handled on one visit. Above the second floor, access decides the method.
Exterior glass, interior glass, screens, frames, sills, and tracks, by hand at reach and with a water-fed pole above it. We will tell you honestly if a pane is etched rather than dirty, because the alternative is charging you to clean something that is not going to change.
If your spotting has a hard line across it, mention that when you call and we will look at the irrigation while we are there. Call (919) 698-3669.
“Windows inside and out, screens included, and not one streak. They even wiped down all the sills.”
“Siding and windows on the same day and the whole house looks lighter. Careful with the beds and easy to schedule.”
“Great communication and fair pricing on short notice. Gutters and driveway both done same visit.”
Everything on the outside of a building, what method each surface actually wants, how often it needs doing, and the handful nobody thinks about until something fails.
Read the guide →GuttersA pressure washer empties a gutter fast, which is exactly why people try it. It also dents the trough, drives water behind the fascia, and packs the downspout tighter than it was.
Read the guide →RoofsAlgae stains a shingle. Moss lifts it. One is a cosmetic problem with a deadline measured in years, and the other is a leak forming right now.
Read the guide →We fly the roofline and show you the footage on the spot. You see your own gutters, joints, and downspouts on the screen instead of taking our word for it. It costs nothing and you are not committing to the cleaning.
Free for homes and businesses across the Triangle and Johnston County. No obligation to book any work afterwards.
Call (919) 698-3669 for a free quote. No obligation.
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