I hate to go against the grain, but I would suggest that a little research should go into topics such as this one. There is much more to carnauba extract than what this post is suggesting. Bleaching isn`t entirely a correct term when referencing White Carnauba. The process is an old industry standard that has been practiced for many years, in which white carnauba is chemically extracted from the raw yellow compound. This post may provide some interesting reading.
http://autopia.org/forum/car-detaili...tml#post803713
The only way to have a meaningful discussion about the attributes of carnauba products is to base the information on referenced facts. Having a conversation based solely on opinion will not really confirm or answer any questions or establish facts.
There are a few veteren carnauba users (myself included) that will also disagree with the duration of longevity of a carnauba finish as described in this post. I have had carnauba finishes that have lasted an entire year (with and without garaging). Again, that is also heresay, but even some wax tests referenced may be helpful in having a discussion about longevity of some products.
Although the topics raised seem interesting, I am left wanting more facts just reading this discussion without established references.