1. Washing the parts of the body in order and consecutively when doing Ghusl is not obligatory according to the majority of jurists. 2. The more correct scholarly view is that rinsing the mouth and nose is obligatory in both Wudu and Ghusl. 3. If a man or woman does Ghusl to remove major impurity, this Ghusl counts for Wudu too. 4. Wudu and Ghusl are valid even if any bits of food remain between the teeth, but removing them is better.