Often people use soaps and detergents assist in the emulsification of oils and dirt particles so they can be washed away.
People usually wash themselves periodically. Little children, the sick, and people with disabilities may be washed by a caregiver. Often a shower or a bathtub is used for persons washing themselves or others. Showers or baths are commonly taken in the nude and often in private.
More frequent is washing of just the hands, e.g. before and after preparing food and eating, after using the toilet, after handling something dirty, etc. Hand washing is important in reducing the spread of germs.
Brushing one's teeth is also a kind of washing.