A friend of mine did the 24H of LeMans with the X1 with rain on almost all the race, and needed to wash the car.
It was the Red Bull Livery but looked like the Prototype.
LoL
Edit:
I think that the car only get dirty on the rain.
Because how I said the race was on the rain, and today when I was going to Gt Life, I stoped to watch those videos, and there was a race on the SSR5(I think) with rain, and a F430 in the race was very dirty, and a little strange, but happened a Ferrari California without the roof, on the rain.
I think that pilot don't like the car.