Man is now able to soar into outer space and reach up to the moon; but he is not moral enough to live at peace with his neighbor!
Krishna insisted on outer cleanliness and inner cleansing. Clean clothes and clean minds are an ideal combination.
There are many who have all these in plenty but who are yet worried or in pain or discontented. They depend on the inner equipment of man, not his outer skill or riches.
You cannot be fresh and feeling fine, wearing a washed vest under an unwashed shirt; or, an unwashed vest over a washed shirt. Both have to be clean, to provide a sense of tingling joy. So too outer and inner cleanliness is but the reflection of the inner achievement.