For remnants of adhesive from protective shipping film----Might try 3M Trim and Adhesive Remover. Safe on your paint. Little dab where needed, let sit for 30 secs and then wipe off.
Rail dust and other contaminants acquired during transit-----Might try poly clay bar with plenty of lubricant.
Polish----if there aren't any swirl marks, why use a SMR? Although a SMR like 3M's or Megs is mild, it still contains abrasives. Why use an abrasive if not needed? If needed, I'd start with a polishing pad (White pad if from LC) with the PC. SMR with polishing pad will remove faint swirl marks.
Polish----Might try a finishing polish like P21S GEPC. If no swirl marks, just use a finishing polish like P21S GEPC. If using PC, use polishing pad.
Assuming that you don't have any swirl marks and that you have Zaino products you desire to use, I might try something like this.....
1. Little dab of 3M Trim & Adhesive Remover only where needed, let sit 30 secs and wipe clean.
2. Dawn Wash
3. Poly claybar with plenty of lubricant (like diluted Z-7)
4. Quickie wash w/ Z-7 auto wash to remove clay residue
5. P21S GEPC using PC and foam polishing pad
6. Another guickie Z-7 wash
7. Z-6 Wipe down
8. Your choice of Z-2 or Z-5 with ZFX
9. Repeat steps 7 & 8 twice for a total of three layers
10. Final Z-6 wipe down
11. Cold beverage of your choice while standing back to admire