Biker Bob's Guide to Domestic Tranquility sounds like it might just make an entertaining read! LOL
I try to use all natural cleaners and (as Biker Bob recommends) try not to let the toilet get a ring before I go to work on it. Once when we came back from vacation, the bowl had a ring that nothing would eliminate and a co-worker told me to throw some denture cleaning tablets in and let them sit overnight. It did seem to reduce the ring and make it easier to scrub what remained away.
A friend of mine who has a house cleaning service says that some of the homes she cleans have such stains in the bowl that she uses a pumice stone on them. It seems to me that an abrasive scrub like that would damage the porcelain but she swears by it.
When I was looking for
http://oooh-baby-baby.blogspot.com/2009/06/how-to-clean-toilet.htmlnatural toilet cleaners I got some tips here and some cautions for those of you who have dogs, cats or other pets inside the home that may drink out of the toilet.