When a car arrives at a dealer, it is compounded to remove swirl marks. Sometimes, the swirl marks are so heavy, they remove a significant amount of the clear coat.
The cars that come from Karachi are shipped via a truck, aur aap ko pata hai truck driver kaisay hotay hai. In some cases, accidents occur and trucks roll over, and most of the cars are recked. I don't know for sure what happens next. Maybe insurance pays them for it. Maybe insurance pays to repair it.
New cars are made in carefully controlled environments, so thete shouldn't be any dust