How Often Should You Clean Your Windows in the Midwest?
Published March 4, 2026
Most window cleaning schedules you find online were written for mild, dry climates. The Quad Cities is neither. We sit in a river valley that holds humidity all summer, we get agricultural dust rolling in off Henry and Rock Island county fields, and we run a hard-water supply that etches minerals onto glass every time a sprinkler clips a window.
The baseline: twice a year
For a typical two-story home in Moline, Bettendorf or Davenport, two professional cleanings per year keeps glass genuinely clear. Schedule the first in late April or May, once pollen has finished falling and the last freeze is behind us. Schedule the second in September or October, before leaves clog gutters and before the first hard frost locks grime onto the glass for the winter.
When you need a third visit
- Your home fronts the Mississippi or a bluff — constant humidity feeds algae film on north-facing glass.
- You live on or near a gravel road, common outside Geneseo, Coal Valley and Milan.
- Irrigation heads spray the windows, which leaves hard-water spotting that gets worse the longer it bakes on.
- You have young kids or dogs and the interior glass is doing most of the work.
Why hard water changes the math
Quad Cities tap water is mineral heavy. When a sprinkler or a rain-splash off concrete dries on glass, it leaves calcium behind. Left for a couple of seasons, that deposit stops being a film and starts being a bond — at which point it needs a restoration polish rather than a wash. Cleaning on a schedule is far cheaper than restoring etched glass later. That is exactly why we run a deionized water system on our window cleaning route: pure water leaves nothing behind as it dries.
Should you do it yourself?
Ground-floor interiors, absolutely. The place DIY falls apart is upper-story exteriors, where a ladder on soft spring soil is a genuine hazard and squeegee streaking is nearly guaranteed on hot glass. If you only hire out one part of the job, hire out the second story.