The Quick Answer
Most homes need professional window cleaning twice a year — once in spring (after pollen) and once in fall (before winter). Add a visit in late summer if you live near the coast, in a desert with hard water, or near tree-heavy lots.
Recommended Frequency by Climate
| Climate / Setting | Suggested Frequency | Why |
|---|---|---|
| Temperate suburban | 2× / year | Spring pollen + winter prep |
| Coastal (sea-salt spray) | 3–4× / year | Salt etches glass if left untreated |
| Desert (hard-water sprinklers) | 3× / year + spot treatment | Mineral deposits bond fast |
| Heavy pollen region | 3× / year | Spring + late summer film |
| Wooded lot (sap, leaves) | 3× / year | Sap and leaf tannin |
| Urban high-traffic | 4× / year | Soot and grit accumulate fast |
Signs to Book Sooner
Don't wait for the calendar if you see:
- Visible streaks or film from inside that aren't there at sunset (means light angle is exposing dust)
- White spots or "rings" — hard-water mineral deposits, which get harder to remove the longer they sit
- Yellow film on south- or west-facing windows (pollen + UV bake-in)
- Bird droppings or sprinkler overspray that's been there more than a week
- You're listing the home, hosting a party, or shooting interior photos
Why Cleaning Schedule Matters
It's not just cosmetic. Hard-water spots and salt spray actually etch the glass over time — a $400 cleaning visit twice a year is cheaper than replacing two etched picture windows. Tracks and sills that go uncleaned accumulate dirt that holds moisture, which can rot wood frames and grow mold inside the wall.
Can You Clean Too Often?
For squeegee-and-water cleaning, no — there's nothing to wear out. The exception is hard-water spot treatment, which uses mild acid. Over-treating glass that doesn't need it can dull the surface. Reserve acid treatment for visible mineral spots, not as a routine.
DIY in Between
Between professional visits, a quick DIY pass keeps glass bright:
- Use a squeegee from the start — paper towels and spray cleaner leave streaks every time.
- Wash on an overcast day. Direct sun dries the cleaner before you can squeegee it.
- Wipe sills and tracks while the glass is open. A vacuum brush attachment makes this fast.
- Avoid pressure-washing the glass itself — the seal between panes can fail.