Good topic. The way I see it, you can't fully enjoy any car if you're concerned about it getting dirty. On the other hand, getting them infamously dirty once in a while serves as a great pretext to go all-way-OCD on the cleaning.
Plus, I only really enjoy seeing cars either very clean or very road dirty.
I remember with great pleasure the time spent detailing motorcycles, a few years ago, after arriving home from +2 week road trips. On a Lisbon-Nordkapp and back trip, once, I think I washed off road kill of 7 different nationalities.
