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Window glass being treated to remove hard water stains

What Causes Hard Water Stains on Windows (and How to Remove Them)

Home Maintenance4 min read

If your windows have cloudy white spots that won't wipe away, you're likely dealing with hard water stains. These mineral deposits are one of the most common — and most misunderstood — window problems in Central Oregon.

Hard water stains form when mineral-rich water dries on the glass. Sprinkler overspray, irrigation runoff and even rain that picks up minerals all leave behind calcium and lime that bond to the surface.

Here's the catch: ordinary cleaning won't touch them. Because the minerals chemically bond to the glass, you need a specialized treatment to break them down without scratching the surface.

The longer stains sit, the harder they are to remove — and severe cases can permanently etch the glass. That's why we always recommend addressing them early. If you're seeing cloudy spots, reach out to Kleanly for a free assessment before they get worse.

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