Window Cleaning in Northbrook, IL & the North Shore

Hard water stains show up as cloudy white spots or rusty orange streaks, usually on lower windows, patio doors and glass near flower beds. They form when water full of minerals dries on the glass and leaves calcium, magnesium or iron behind. Each new layer bonds to the last one, so the spots get harder to remove every season.

In Lake County, the water source makes a big difference. In Long Grove, homes draw their water from community or private wells rather than Lake Michigan, and well water usually carries more minerals. When a lawn sprinkler hits the same windows every morning, those minerals build up on the glass much faster than rain ever could.
We see the same pattern in Riverwoods, where some homes use Lake Michigan water and others rely on private wells. The Illinois EPA private well guidance explains how well water can vary from home to home. Iron-rich water tends to leave orange streaks, while calcium leaves white rings that look like the glass has been frosted.

Regular glass cleaner won't remove these spots because they aren't dirt sitting on the surface. They are mineral deposits bonded to the glass. Left for years, they can start to etch the surface, which means the glass itself is damaged, not just covered. That's why the timing of treatment matters more than the product used.

"Almost every hard water case I see starts with a sprinkler hitting the same windows every morning. Most homeowners don't notice until the spots have been there for a couple of summers, and by then some have tried scrubbing them with a razor or an abrasive pad, which can scratch the glass for good.

If you catch it in the first season and turn the sprinkler heads away from the house, the spots come off and usually don't come back. That's why on every visit we look at the lower windows, tell you honestly what can be removed, and show you which sprinklers are causing it, so you're not paying to fix the same problem every year."
– Dima, VECO specialist

Every hard water job starts with a small test area, so we can see how deep the deposits go before we treat the whole window. Then we apply a mineral-dissolving treatment, work it in with a non-scratch pad and rinse the glass clean. Frames, sills and nearby screens are rinsed too, so no residue is left behind.

Not all glass can be treated the same way. Many newer windows have tempered glass or low-E coatings, and the wrong pad or product can leave scratches or damage the coating. We check the type of glass first and choose the treatment that suits it, so the spots come off and the glass and its coating stay undamaged.

We'll always tell you what to expect before we start. Fresh spots from this season usually come off completely. Older spots that have etched the glass can be made much lighter, but some marks may stay visible up close in direct sunlight. See how we cleared years of mineral scale from a skylight in Arlington Heights before deciding if treatment is worth it for your windows.

Hard water removal can be added to any regular window cleaning visit, so you don't need to book a separate trip. Early summer is a good time, before a full season of sprinklers bakes the minerals in. Mention the spots when you request an estimate, and we'll list the treatment as a separate item so you can decide.