If it was sitting in the garage, I'd just wipe it with a MF towel or QD spray to get the dust off. If it was driven, then a quick wash is probably a good idea.
I think im gonna detail a black bmw 540 one of these days. not sure yet but im wondering if the nxt/#26 will be a good combo for a black car? This is my first true detail job other than friend's cars and stuff and i really want that bmw to glow.