If you're dealing with hard water stains on your shower doors, mirrors, or even your glass windows, this bathroom staple ...

Q: Is there any way to remove hard water spots from a glass shower door? A: When glass doors are left to dry on their own ...

When glass is washed with hard water ... could use either a commercially made product or a homemade one to remove hard water stains. For a homemade solution, you will need distilled white vinegar.