We've been using the Dow Scrubbing Bubbles products for years, and their Automatic Shower Sprayer unit is absolutely fantastic for keeping the shower and tile and grout spotless. You just push the button after showering, it beeps and gives you 15 seconds or so to get out and close the door/curtain and it sprays the liquid 360 degress. That is it.
I use Chlorox whenever possible, but this is far better for keeping the shower clean.....
far less toxic and you don't have to handle anything or be near it breathing fumes when it sprays. You can leave the room before it sprays.
Our shower is 4 years old and the grout is sparkling white like brand new.
See:
http://www.scrubbingbubbles.com/Prod...r-cleaner.aspx