The verse of interest here is Heb 10:22 (ESV):
Let us draw near with a true heart in full assurance of faith, with our hearts sprinkled clean from an evil conscience and our bodies washed with pure water.
Now Jesus talks about a watery flow out of the heart as being a function of the Holy Spirit.
John 7:38-39 (ESV):
Whoever believes in me, as the Scripture has said, ‘Out of his heart will flow rivers of living water.’” Now this he said about the Spirit, whom those who believed in him were to receive, for as yet the Spirit had not been given, because Jesus was not yet glorified.
Additionally there many other Scriptures likening the heart to water.
Prov 27:19 (ESV):
As in water face reflects face, so the heart of man reflects the man.
Prov 21:1 (ESV):
The king's heart is a stream of water in the hand of the Lord; he turns it wherever he will.
Does this suggest that Holy Spirit will literally cleanse the physical body?