I think he should detail it too.....keep it only in his garage.
Never drive it on the road.
If you take it anywhere, take it in a enclosed trailer and put it back in the enclosed trailer when taking it back home. That way he will never get a bug on it.
Nice cars should be poser car's only..... never should be used on the public streets without bringing someone along to detail it and every stop.
Cudaman
P.S. I did see the same car that night ..... it did look clean then