I agree with Juan Eduardo in which there is no scientific dream interpretation and objective. Any interpretation is subjective and relative to school psychological from which is made and even arbitrariness of the person who interprets. One of the interpretations more consistent is the psychoanalysis that not only seeks the meaning of dream content but your emotional relationship with the dreamer. It is not the same dream with esbotar beans in the kitchen of my grandfather in a pleasant situation as esbotar beans with anguish. What is certain is that dreams are expressions of our unconscious, which, in the opinion of the sicoanalistas, dominated by two contrary instincts, creative instinct and the thanatos, libido or destructive instinct.
Does not exist, a specific form to give interpretation or meaning to a dream, as dream of lice (lawsuits and poverty), someone to dream that you die (long life), etc..., there are books that give you some guidelines, but depend on for everyone, as it believes, by the books that I have read, (don't remember the author) dream clean "something" would be like shake or remove a problem.