Water Marks on Windows: Causes, Removal, and Prevention

At 6 a.m. in the Phoenix Valley, the sprinklers may still be hissing while the first sunlight exposes a milky film across the east-facing windows. You see faint drips on the lower sash, curved splash marks near the sill, and cloudy patches where irrigation has struck the glass. The pane looked clean yesterday. This morning,

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