Just to add I bought myself a Rupes orbital polisher they are pricey but very good and take a lot of effort out of a deep polish finish. I found mine broken on Ebay but an easy fix replacing trigger switch and it's like new. Lovely bit of kit.
I wouldn't mess around wth multiple products, Autoglym is all you need really if your not obsessive and just want to do a good job.
Buy the products when there is a 2 for 1 at Halfords.