(Undertaker) If one sees a deceased person washing himself before burial in a dream, it means relief for one’s dependents and increase of their wealth after him. Washing a deceased person in a dream means that someone will repent at the hand of the undertaker. If a deceased person asks someone to wash his clothing in a dream, it means that he needs someone to pray for him, or to intercede on his behalf before his Lord, or pay charity for the benefit of his soul, or to satisfy his debts, or to fulfill his will, or to seek justice for his death. If one does wash the garment of the deceased person in the dream, it means the redemption of that person. Washing a deceased person with boiling water in a dream means that the latter is suffering in hell-fire. (Also see Grave digger | Hot water | Ritual bath | Undertaker)
Read more about dreaming of Washing the dead in other dream meanings interpretations.