Boise summers are hard on glass in a way that is easy to misread. The visible problem is dust, which is cosmetic and rinses off. The expensive problem is irrigation overspray baking mineral onto south and west elevations through July and August, because that damage accumulates rather than washing away.
Valley irrigation water is hard. When a sprinkler head clips a window during peak summer watering, the water evaporates fast in the heat and leaves its mineral content sitting on the glass. Repeat that daily for two months and the deposit stops being a film and starts bonding to the surface. That is the difference between a window that needs cleaning and glass that needs hard water stain removal.
On a 95-degree afternoon, water on south-facing glass evaporates before it can be worked, which is exactly how spotting happens. Summer work in Boise gets scheduled early in the day or onto shaded elevations for a reason, and any crew willing to do a south face at 3pm in August is going to leave marks.
Late-summer smoke settles fine ash onto horizontal and angled surfaces, including solar panels and skylights. On solar it is worth attending to because output drops with coverage. On glass it rinses off readily, so it is not urgent, and there is no sense cleaning mid-event when more is coming.
Check every zone while it runs and re-aim anything reaching the house. If the glass already has visible white deposit that does not wipe off, that is a stain removal job quoted by severity rather than a normal clean. Monthly membership includes hard water stain removal, which is aimed squarely at homes that fight this every summer.
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Almost always sprinkler overspray. Irrigation water in the valley is mineral-heavy, and summer heat evaporates it fast enough to leave the minerals behind on the glass.
Yes. Left through repeated summers, mineral deposit etches into the glass surface. Early deposits come off cleanly; deep etching can be improved rather than fully reversed.
Generally wait until the event passes. Ash rinses off glass easily, so there is little benefit to cleaning while more is still falling. Solar panels are the exception.
No, but timing within the day matters. Work gets scheduled to avoid direct sun on the glass being cleaned, since flash evaporation is what causes spotting.
The 7-Day Rain Guarantee covers rain spotting. It does not cover sprinkler overspray, which is a separate and more common summer issue.
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