‘Sadhana’ means inner cleanliness as well as external cleanliness. You do not feel refreshed if you wear unwashed clothes after your bath, do you? Nor do you feel refreshed if you wear washed clothes, but skip the bath. Both are needed, the external as well as the internal.
(From : Sai Veda, The Word of God, sayings of Bhagavan Sri Sathya Sai Baba)