Shower Wall and Glass Door Cleaner
White vinegar, warmed
For easy removal of hard water spots off shower walls and glass doors, use undiluted, heated white vinegar. Fill a Large ceramic mug with vinegar, place in microwave for a minute or so, and splash into the shower, or pour heated vinegar into a spray bottle, spray on.
Leave it for at least 15 minutes, than scrub with a mix of 1/2 c. borax, 1/2 c. baking soda.