I have a black FPV, it gets used in fine weather mostly and never sees daily driving duties, always stored in a clean garage, first and probably the last black car I would ever own, it simply does not stay visibly clean for more than an hour after its washed and dried lol. It is the ultra fine layer of dust that is present on every car that is quite noticeable on shiny black paint! It is in what I would call excellent condition but any paint imperfections are magnified x10. However, and it is a big however is that it looks absolutely amazing when it’s spotless. Something about a black car and in the right shape and model looks damn cool. I’m very particular so the appearing clean drives me nuts, be careful and using the right cleaning methods and it will be fine.
Had a black AU XR8. Like you. Never again with black. Looks great when it was clean and from a distance but it did my head in continually having to clean the bloody thing.