Dusty interior's cool, shows you rock it offroad.
Personally, a fitted sheet over the back seat with bungies is all I do. Everything else can be vaccumed and wiped down. I rarely have passengers in the back, but i wouldn't want to sit in a dusty dirty seat either.
otherwise be sure to be the first in the convoy or keep the top up and windows in and save the top down for posing around town.