How do I remove hard-water stains from windows in Tucson?

Hard-water residue on Tucson windows requires an acid-safe restoration pass; regular squeegee cleaning won't remove it. The white or cloudy film on windows exposed to sprinkler overspray, pool splash, or landscape irrigation is mineral deposit (mostly calcium and silica) bonded to the glass surface. A standard exterior window wash lifts dirt but leaves the mineral bond in place. Hard-water spot treatment is an available add-on to our residential window and glass cleaning appointment: a mild acid restoration compound applied by hand, agitated, and thoroughly rinsed off. Older or heavily etched stains may only lighten rather than fully clear — we set expectations at pre-inspection.