Arm & Hammer "Clean Shower".

The label sez "Just spray and walk away" and that's what I do!

I have a little... issue... with cleanliness. (ask Trek. I got to her house last month and promptly cleaned her kitchen. I did her car the month before.) Anyway, this stuff really works! You take yer shower and then spray the walls/tub/curtain, and no cooties grow! I've been using it for a month now, and my shower still looks spic-n-span! (I haven't actually scrubbed my shower in all that time.)

Gives me more time for biking.