[header] How to clean glass shower doors [title] Wipe with a fabric softener sheet or magic eraser. [step] Wipe a damp dryer sheet or mr clean magic eraser over the mineral stain and it may come off directly. This won't always work, but is often a quick and convenient option to start with. 
Either way, rinse off the door afterward to remove the cleaning product. [substeps] Be aware that some dryer sheets may leave scent on the shower door.