I too dislike the dirt mechanic. I have one of the dirtiest jobs imaginable and am outside in the middle of nowhere camping for weeks at a stretch. My hands and face are always clean. It is called water and a kerchief. Any self respecting adventurer has both.
Will mod this stupid thing out asap.
Hold up. Wouldn't it be even better to have characters clean themselves after a fight? It could be one of those idle animations that add flavour and realism to the game. The extent and manner in which characters like to clean themselves after a fight could also be made into a show of their personalities. Some might leave the dirt where it is, because it provides camouflage and protection from insects bites. Some might want to lick the blood of themselves and their weapons. Others could take great care in removing all spots from their robes ... Things like that could really bring characters to life.