Glass Cleaner: Use a glass cleaner or a mixture of vinegar and water to clean mirrors and glass surfaces.
If you already have a build up of hard water in your shower, simply spray white vinegar directly on the stained area and allow it to sit for 30 minutes.
"The ONLY cleaner I use for everything is washing up liquid, white distilled vinegar, and water.
Shower Doors: Prevent soap scum build-up on glass shower doors by using a squeegee to remove water after each use.
Use a grout cleaner or a mixture of bicarbonate of soda and water to scrub the grout lines.