And what did Jeremiah say, Jeremiah living at approximately the same time as Ezekiel:Ezek. 36:25-27 - the Lord promises He will sprinkle us with water to cleanse us from sin and give us a new heart and spirit. Paul refers to this verse in Heb. 10:22. The teaching of Ezekiel foreshadows the salvific nature of Christian baptism instituted by Jesus and taught in John 3:5, Titus 3:5, 1 Peter 3:21 and Acts 22:16.
KJV) For though thou wash thee with nitre, and take thee much soap, yet thine iniquity is marked before me, saith the Lord GOD.
Or, in another translation:
(CEV) The LORD said: People of Israel, you are stained with guilt, and no soap or bleach can wash it away.
IOW, he mocks them for trying to wash away their sin through baptism, through the element of water. Even if they use the strongest possible soaps known to mankind--such as bleach in our day, it will do no good. The sin will remain. Such is baptism. It will get you wet, but that is all.
Baptism has the same efficacy that the waters of the Ganges River has for the Hindus. They also go and baptize themselves in those polluted waters thinking it will wash away their sins. They have as much chance as the Catholic who believes in baptismal regeneration. It is a superstition and that is all. It is akin to the Hindu pagan belief. It has no power to wash sin away. Jeremiah mocks it.
The only thing that can wash away your sin is the blood of Jesus Christ.
1Jn 1:7 But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.