Funeral

Question: What are the sunnah materials to use in terms of washing the deceased? I’ve heard that we should use water boiled with leaves of a certain tree. I’ve heard various names of trees such as lotus, sidr, lote and saltwort. Is this correct? If so, which tree/s is the best to use? Washing the hair: Is it correct that we should use marsh mallow plant? Applying perfume: Is it true that we should use something called Hanut on the head/beard? I tried to find out what it is but did not manage to find anything.