“(which is symbolic for the present age). According to this arrangement,
gifts and sacrifices are offered that cannot perfect the conscience of the worshiper, but deal only with food and drink and various washings (baptismois in Greek), regulations for the body imposed until the time of reformation. But when Christ appeared as a high priest of the good things that have come, then through the greater and more perfect tent (not made with hands, that is, not of this creation) he entered once for all into the holy places, not by means of the blood of goats and calves but by means of his own blood, thus securing an eternal redemption. For if the blood of goats and bulls, and the sprinkling of defiled persons with the ashes of a heifer, sanctify for the purification of the flesh,
how much more will the blood of Christ, who through the eternal Spirit offered himself without blemish to God, purify our conscience from dead works to serve the living God.”
Hebrews 9:9-14 ESV
https://bible.com/bible/59/heb.9.9-14.ESV
According to Hebrews here, baptisms as regulations for the body were never able to perfect the conscience. I believe our conscience is purified when we are sealed in Christ by the Holy Spirit upon belief as in Ephesians 1:13.
“In him we have redemption through his blood, the forgiveness of our trespasses, according to the riches of his grace,”
Ephesians 1:7 ESV
https://bible.com/bible/59/eph.1.7.ESV