Why does my shower glass get stained?

Over time the mineral deposits in the water create water spots and stains, if left un-cleaned they can quickly become an eyesore and start to damage the surface and structure of the glass. If left too long the damage will become un-repairable and you will need to purchase new glass.

How should I clean my shower once it has been restored?

Avoid acid based cleaners if possible, sometimes they can actually do more harm than good in as some can etch your surfaces, permanently damaging them, not to mention the extreme care needed when using these harmful chemicals. Also after the last person showers for the day, using a squeegee or microfibre cloth, wipe all water drops from your glass, this will help to prevent hard water staining re-appearing.