First when one is born again, they are a new creature, circumsized in the spirit.
2 Corinthians 5:17
Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.
Deuteronomy 10:16
Circumcise your hearts, therefore, and do not be stiff-necked any longer.
Deuteronomy 30:6
The LORD your God will circumcise your hearts and the hearts of your descendants, so that you may love him with all your heart and with all your soul, and live.
Jeremiah 4:4
Circumcise yourselves to the LORD,
circumcise your hearts,
you men of Judah and people of Jerusalem,
or my wrath will break out and burn like fire
because of the evil you have done—
burn with no one to quench it.
Romans 2:28-29 (New International Version)
A man is not a Jew if he is only one outwardly, nor is circumcision merely outward and physical. 29No, a man is a Jew if he is one inwardly; and circumcision is circumcision of the heart, by the Spirit, not by the written code. Such a man’s praise is not from men, but from God.
Ezekiel 11:19
I will give them an undivided heart and put a new spirit in them; I will remove from them their heart of stone and give them a heart of flesh.
Ezekiel 18:31
Rid yourselves of all the offenses you have committed, and get a new heart and a new spirit. Why will you die, O house of Israel?
Then there is imputed or positional “salvation” ( for lack of better word ) God the Father sees us through Jesus. Another way of saying this we are under his covering, a covering of blood.
Psalm 32:2
Blessed is the man unto whom the LORD imputeth not iniquity, and in whose spirit there is no guile.
Romans 4:6
Even as David also describeth the blessedness of the man, unto whom God imputeth righteousness without works,
Romans 4:8
Blessed is the man to whom the Lord will not impute sin.
Romans 4:11
And he received the sign of circumcision, a seal of the righteousness of the faith which he had yet being uncircumcised: that he might be the father of all them that believe, though they be not circumcised; that righteousness might be imputed unto them also:
Romans 4:22
And therefore it was imputed to him for righteousness.
Romans 4:23
Now it was not written for his sake alone, that it was imputed to him;
Romans 4:24
But for us also, to whom it shall be imputed, if we believe on him that raised up Jesus our Lord from the dead;
Romans 5:13
(For until the law sin was in the world: but sin is not imputed when there is no law.
James 2:23
And the scripture was fulfilled which saith, Abraham believed God, and it was imputed unto him for righteousness: and he was called the Friend of God.
Note: our position “in Christ”
Ephesians 1:3
Blessed be the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly places in Christ:
Ephesians 1:10
That in the dispensation of the fulness of times he might gather together in one all things in Christ, both which are in heaven, and which are on earth; even in him:
Ephesians 1:20
Which he wrought in Christ, when he raised him from the dead, and set him at his own right hand in the heavenly places,
Ephesians 2:6
And hath raised us up together, and made us sit together in heavenly places in Christ Jesus:
Ephesians 3:6
That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel:
The final cleansing you are asking about is symbolized by the white robes that we recieve in heaven, likely before the judgement.
Isaiah 1:18
“Come now, let us reason together,” says the LORD. "Though your sins are like scarlet, they shall be as white as snow; though they are red as crimson, they shall be like wool.
Revelation 6:11
Then each of them was given a white robe, and they were told to wait a little longer, until the number of their fellow servants and brothers who were to be killed as they had been was completed.
Revelation 7:9
The Great Multitude in White Robes ] After this I looked and there before me was a great multitude that no one could count, from every nation, tribe, people and language, standing before the throne and in front of the Lamb. They were wearing white robes and were holding palm branches in their hands.
Revelation 7:13
Then one of the elders asked me, “These in white robes—who are they, and where did they come from?”
Revelation 7:15
And he said, "These are they who have come out of the great tribulation; they have washed their robes and made them white in the blood of the Lamb. Therefore, "they are before the throne of God and serve him day and night in his temple; and he who sits on the throne will spread his tent over them.
The purification is from being washed in HIS blood,
Revelation 1:5
And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood,
Revelation 7:14
And I said unto him, Sir, thou knowest. And he said to me, These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb.
Some will see this cleansing occuring conconcurently with the Resurrection when mortal puts on immortal.
I Cor 15:53
1 Corinthians 15:53 (King James Version)
For this corruptible must put on incorruption, and this mortal must put on immortality.