Use a dedicated water spot remover or a vinegar solution on fresh spots. Etched spots need polishing.
Why water spots stick
Hard water leaves mineral deposits that bond to glass. In the Texas sun they bake on quickly, and over time the minerals can actually etch the surface.
Removal options
- Fresh spots: 50/50 white vinegar and water on a microfiber
- Older spots: a dedicated water spot remover
- Etched spots: glass polishing by a professional
Prevention
Dry your car after washing, avoid parking near sprinklers, and keep glass clean so minerals have less to grip.