One seeking one's own good, should never drink curds finishing his meal. After the meal is finished, one should wash his mouth and face with the (right) hand only, and taking a little water should then dip the toe of the right food in it.
दधि चाप्यनुपानं वै न कर्तव्यं भवार्थिना॥ आचम्य चैकहस्तेन परिप्लाव्यं तथोदकम्।