Most homes need professional window cleaning twice a year: once in late spring after pollen season ends, and once in early fall before the weather turns. Homes with heavy tree cover, lawn sprinklers hitting the glass, or a lot of west facing windows usually need a third visit to stay ahead of buildup.
That is the short answer. The longer answer depends on what is actually landing on your glass, and in central Indiana that changes a lot from season to season.
Why twice a year works for most homes
Two visits, spaced roughly six months apart, catch the two seasons that do the most damage.
Spring is pollen. Tree pollen coats everything from late March through May, and it does not rinse off cleanly because it sticks to the film already on the glass. Cleaning before pollen season ends just means doing it again. Cleaning after it ends means the glass stays clear through summer.
Fall is everything else. Summer storms drive dust onto the glass, sprinklers throw mineral heavy water at the lower panes all season, and by September most windows are carrying a layer you stopped noticing months ago. A fall cleaning also means the glass goes into winter clean, which matters because road salt spray and freeze thaw cycles are harder to remove once they have sat.
When you need more than twice a year
Some homes are simply harder on glass. If more than two of these apply to you, plan on three visits a year rather than two.
| Factor | Why it matters |
|---|---|
| Sprinklers hit the windows | Irrigation water is untreated and mineral heavy. It leaves deposits that get harder to remove every cycle. |
| Heavy tree cover | More pollen, more sap, more organic debris in the tracks and on the screens. |
| West or south facing glass | More sun means solution and water dry faster on the surface, which bakes deposits in place. |
| Gravel drive or nearby construction | Fine dust settles constantly and bonds with humidity. |
| Pets or young kids | Interior glass gets marked far faster than most people expect. |
| You are selling the house | Clean glass changes how bright every room photographs and shows. |
When once a year is enough
Once a year is reasonable if your windows are shaded, your sprinklers do not reach the glass, and you are not fighting hard water. Newer homes on open lots without irrigation often do fine on a single annual cleaning, usually in fall.
The risk with an annual schedule is that you stop noticing gradual buildup. Glass does not get dirty in a way you see day to day. It gets dirty in a way you only notice the week after it has been cleaned.
What happens if you wait too long
Ordinary dirt does not damage glass. It just sits there until someone removes it. Two things do cause real damage, and both get worse with time.
Mineral deposits. Water that dries on glass leaves calcium and magnesium behind. Left through enough wet and dry cycles, those deposits bond to the surface and eventually etch it. At that point no amount of cleaning brings the glass back. We wrote about what causes hard water spots and what actually removes them in more detail.
Track debris. Grit packs into the bottom channel until the sash drags, sticks, or stops sealing. That is a mechanical problem, not a cosmetic one, and it is why window track cleaning is worth doing at the same time as the glass.
Spring or fall, if you can only do one
Fall. A fall cleaning removes a full season of sprinkler minerals and summer grime before winter locks it in, and it means your glass is clear through the darkest months of the year, which is when you notice light the most.
Spring is the better choice only if you are hosting something, listing the house, or your pollen load is severe enough that summer is genuinely unpleasant to look through.
Frequently asked questions
How long does a professional window cleaning last?
Exterior glass typically looks clean for three to six months depending on weather, exposure and whether sprinklers reach it. Interior glass usually holds up longer, often six to twelve months in a home without pets or small children.
Is it worth cleaning windows in winter?
It can be, on dry days above freezing. The bigger issue is that exterior work in wind and cold produces worse results, so most homeowners in central Indiana schedule around it rather than through it.
Does rain undo a window cleaning?
Not usually. Rain alone is fairly clean. What marks glass is rain running over a dirty frame or roof edge and carrying that residue down the pane, which is why the frames matter as much as the glass.
Should screens be cleaned every time?
Not necessarily, but a dirty screen will dull a window you just paid to have cleaned. Most homes do screens once a year and glass twice.
Getting on a schedule
Clearwater Window Cleaning is owner operated and serves Carmel, Fishers, Westfield and Noblesville. If you are not sure what your windows actually need, we will give you an honest read rather than selling you a schedule. See what a residential window cleaning covers, or call or text (317) 502-8135 for a quote.
