If there is no other water, used water can be used for making wudu and ghusl. The writer is an educator. He sometimes put oil in his hair and combed it.
Urine is dirty essentially; a garment is essentially clean but it becomes dirty due to the urine that smears on it. It is wajib to do it. Best Rate it Muslims throughout the world have extremely high standards of personal hygiene, because Islam places great emphasis on both physical and spiritual, cleanliness and purification.
If something like that is not washed in a container but in a stream or by pouring water on it, it is regarded to have been cleaned if no trace of dirt remains.
Therefore, after slaughtering such an animal, the flowing blood on it and the inner parts should be removed and washed; and then it should be put into hot water.