Dreams that deal with the guilty feelings of a shameful act usually consist of uncleanliness, low self-esteem, sin, dirty hands.
Dreams about being dirty are often associated with underlying guilt or negative inner dialogue. Whatever action our minds are trying to keep up with. They may be worrying about picking up after themselves in the the subconscious desire for cleanliness even though consciously they might have not been aware of this need. It is common to have these thoughts accompanied by memories or feelings that are only known to us subconsciously and sometimes they always deal with unhappiness over past events.
If a person dreams of themselves as doing something in the way of cheating, being indolent, or being irreverent, the dirty image may be an indication that one is struggling with their sense of guilt for these actions.