Some pattern within you (depending on where the dirt is) is in need of a good scrubbing....
(Filth) Adirty face in a dream represents a rare art, while a filthy body represents a sinful person....
To dream about sand dollars represents your hidden skills or talents....
Dirt is associated with farming, and therefore with fertility and growth. Something underneath the ground symbolizes the unconscious. Because of the social importance of cleanlines...