I agree with Tex, if you are doing the Dawn thing you can skip the clay bar. I used a clay bar on my 4 year old 300m last weekend but I figured I could use the "heavy hitter" part of the clay bar. This weekend the X-fire gets the royal treatment and I'm doing the clay bar, mainly because I have one left and figured I'd use it. Here's what I did last weekend on the 300m:

1. Wash and dry with Z-whatever Zaino wash
2. Apply clay bar
3. Wash and dry with Zaino wash again
4. Apply Z-whatever Zaino polish (with ZFX), I agree with Tex this is a must do
5. remove polish and apply Z-whatever gloss enhancer
6. repeat steps 4 and 5.
7. Think about repeating steps 4 and 5 before deciding you're exhausted and it already looks great.
8. Relax from exhaustion.

Seriously, it was a lot of work but worth it. After driving through the dry, dusty conditions in my neck of the woods during the week I'm sold on Zaino.