Where We Usually Find Hard Water Spots
- Lower rows of windows facing the lawn
- Lanai sliders and sliding glass doors
- Glass near pools and pool cages
- Waterfront and canal-facing windows
- Storefront glass near irrigated landscaping
What the Treatment Involves
In general terms, hard water treatment is a slower, more careful version of hand cleaning. Every job is a little different, but it usually goes like this:
- Assess. We look at the spotting, any tint or film, and signs of etching, and talk through what's realistic.
- Test. We treat a small area first to see how the minerals respond.
- Treat by hand. We use a cleaner made for mineral deposits on glass with non-scratch pads, working one section at a time.
- Rinse, dry and check. The glass is rinsed and dried so no new spots form, then checked in good light before we move on.
Please don't attack mineral spots with razor blades, steel wool or scouring pads. They can scratch glass and ruin tint and coatings, and a scratch is permanent.
How to Keep the Spots From Coming Back
Treatment removes what's there; prevention keeps it from building up again. The biggest single fix is the sprinkler system. Walk the yard while it runs and turn any head that sprays the windows, sliders or screens back toward the lawn. Heads get knocked out of line by mowers and landscaping work, so check again a few times a year. If your irrigation runs on well water, keeping the spray off the house matters even more, because that water tends to carry more minerals. If you rinse windows yourself, dry them with a squeegee or microfiber cloth instead of letting them air-dry. And keep up with regular cleaning, since fresh spots come off much more easily than old ones. Our guide to salt air and hard water spots in Southwest Florida has more home tips.
Frequently Asked Questions
Can every hard water spot be removed?
No. Fresh and moderate spots usually come off, but glass that's been etched by long-standing minerals may improve without coming out completely. We test a small area and tell you what to expect first.
Why didn't my last cleaning remove the spots?
Regular cleaning removes dirt and pollen. Mineral spots are bonded to the glass and need a separate treatment.
Is it safe for tinted or Low-E windows?
Some films and coatings need extra care. Tell us about them when you request an estimate and we'll check and test those windows first.
How do I keep spots from coming back?
Turn sprinkler heads away from the glass, check them after mowing, and dry the glass if you rinse it yourself.