I tried ZAINO and didn't like it. No matter what you do it always leaves a residue. It always feel like there's a thin coat of oil on the finish. Frankly, it does not, IMHO, warrant the extra work.
I then tried the products from these guys
http://www.detailedimage.com/
This is awesome stuff they have. The Nattys Blue paste wax is incredible. All the benefits of the ZAINO multistep but in one step.
The SSR stuff is also great and works very well with PC orbital or rotary buffers.