cleaning hard water from shower glass

Ok-- My show glass doesn't look good at all. I am writing this basically for myself, but I am resolute to have them look like they did 5 years ago.

Instructions
1- wipe shower doors down with lemon juice.
2. make a paste with vinegar and baking soda, about the consistency of soft scrub. Use a scotch scrubbing pad or a tooth brush. See instructional video below


 http://www.ehow.com/video_4791130_remove-stains-glass-shower-doors.html