car polishes/cleaners

[Preston Brown <pbrown@econ.yale.edu>]

What is the best car polish and/or cleaner that I can use for my Audi?  I 
know that some purists are "just use carnauba" types, but all the R&D 
that companies put in must have come up with something at least 
comparable.  And you can't help but see these silly informercials on TV 
from companies like Blue Coral for polymer stuff.  Question: Does it 
work?  What's wrong with it?  

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 -Preston Brown
  preston.brown@yale.edu