claying a new car is common, especially in the north. I got my '99 ss new with a ton of raildust on it, which I had to use a claybar to remove to do a good first wax job. Depends where the car has been before the dealer and if the dealer does any prep to it before you get it. I had requested no prep on mine, and there was a transporter strike at the time so the car sat for a month in NJ before I got it. what a pita that was.
Same for polishes, just because it's new doesn't mean it's perfect and does not need polish. Not using a polish or swirl remover applies to new finishes when the paint/clear has just been applied and not fully cured. When you get a new car from the dealer this almost always does not apply as it is fully cured by the time you get it.
I have poorboy's / natty's pastewax, not the blue, and like it. It lasts a good 3 months easy and more; the car wash soap has a lot to do with it also though. I would give a thumb up to any poorboy's product, if you're looking for a one-step longer lasting then I would go with their EX-P sealant or EX w/carnuba over the blue pastewax.