As yeldarb said, talk to ZAS, they are brilliant.
Have a look here http://www.zas.com.au/detailing_library.php
Click the detailing flowchart and that pretty much shows you how to proceed, really useful.
There is also a section in the FAQ on their site about using detergents, give it a read.
Let ZAS know your after some help. They gave me heaps of info and advice when I started detailing my car and my girlfriend's.
Good luck
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