Is the described method for washing correct, and what is the best way to remove impurity from the body?

For ghusl (definition), it is sufficient to circulate water over the entire body with the intention, and to ensure water reaches hidden areas and hair roots. As for removing impurities (najasa): If the impurity has a physical mass, it must be removed, then water should be poured over the spot until the characteristics of the impurity—color, smell, and taste—are gone. If the impurity is non-physical (hukmiyya), then water should be poured over it until it covers it, and it does not matter if a slight color or smell remains that is difficult to remove. It is a condition that water is applied to remove the impurity.