How do I purify myself from impurity, and what is the method?

You must ignore obsessive thoughts and not give in to them. It is sufficient to wash the area of impurity by turning on the shower until it disappears, and the strong presumption of its disappearance is enough. One should not linger in the bathroom, and the default state of things is purity. Impurity is not determined except with certainty. If you doubt that urine splatter has touched you, then rule that the body is pure. It is permissible to use pure tissues for istijmar (cleansing after defecation), but if the impurity spreads outside the exit point, wiping is not sufficient; rather, washing with water is necessary. If the essence of the impurity is removed from a garment, it becomes pure. The dryer does not become impure by placing clothes in it after the essence of the impurity has been removed.