I clay bar a vehicle the very 1st time I apply Zaino products to it. It is supposed to be a really good thing for new cars that may or may not have been transported to the dealer from the factory by rail. They say that it will pull the steel micro fibers out of the paint that get embedded during the rail transport from the wearing of the rails themselves.
However, more and more often today's vehicles are covered with a heavy wax product and plastic for shipments so things like that are less likely. I found that my wife's new X3, built in South Carolina, to already be baby smooth when I used the clay bar a couple of months ago.
Eastwoods makes a kit that will remove fine scratches from windshields. It consists of a powder that you make into a paste and a very stiff felt wheel for your drill. It will clean up auto glass pretty well.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI