Debelli,
claying a new car IS beneficial, because all cars are transported to the dealer somehow. That means debris, rail dust, dust & dirt. Clay is harmless to the paint if it is lubricated well while claying. Of course, don't use aggressive clay on a new finish. Choose a mild one.
Industrial fallout is about everywhere, and that includes FL, too. Have you ever followed a smoking old beater? Or did you noticed how oily/dirty a racing car/helmet can be? That stuff sticks to the finish. Etc., etc.
And no, clay won't compromise any clearcoat. Because of lubrication, the clay glides over the paint, like a hovercraft, but pulls the embedded particles from it. It is abrasive, but even a good MF towel is abrasive on the microscopic level. Yes, the wedge-shaped fibers can even out some surfaces and lift off even bacterii. So, it is more beneficial if you clay. Try on the horizontal surfaces first. If nothing shows up, you can even put it down. Do the baggie test, or beg a pair of thin plastic gloves from the nice lady behind any meat/fish etc counter. Examine the surface before/after. Try it with polishes between your fingers. You'll be surprised...
rjp,
SSR is surely working fine. AIO is more interesting. No matter what the logic says, it is definitely good to lay down two coats of AIO. First, it has some abrasives; containing a tad more than 10% of cleaners. The chemical cleaner in it is fatty alcohol esther. The first time if you work it in a little harder, it will clean very effectively, breaking down the "Polierkreide" (polishing chalk in German; its abrasive) very fast; laying down some acrylic. The second application (very light and gentle), ensures complete coverage, and makes the surface slicker and a smoother - more acrylic. This time, you don't have to work it in, just use it like a lotion, creaming the car thinly and easily. This will increase the protective side of AIO, too.
Then throw several coats of UPP on it, and yeehaw!