"Washing" is a symbol of man's moral and spiritual cleansing by the "Water" of the Word of God's Will fulfilled by man and expressed in the Teachings of the Prophets, Jesus Christ and the Apostles.
"Washing" is man's correction of false thinking and sinful way of life by his turning to following God's Commandments, his constant spiritual efforts aimed at acquiring righteousness, at preserving and multiplying the achieved spiritual and moral purity before God.