Grace cannot be grace if it is merited. It becomes debt, not grace.
Grace means we do not have to do all these works forever just to be able to go to the temple to worship God:
The Burnt Offering; The Grain Offering; The Fellowship Offering; The Sin Offering; The Guilt Offering; Dietary Laws; Purification After Childbirth; Cleansing From Infectious Skin Diseases; Cleansing From Mildew; Discharges Causing Uncleanness; The Day of Atonement; Rules for Priests; The Sabbath; Firstfruits; The Passover and Unleavened Bread; Feast of Weeks; Feast of Trumpets; Feast of Tabernacles; Oil and Bread Set Before The LORD; the Sabbath Year; The Year of Jubilee; Circumcision.
It means you do not have to have a special bath and sacrifice an animal for having your menses, or for sitting where someone else had their menses.
Jesus' blood makes us clean once and for all.
It does not mean we no longer have to obey Jesus and abstain from evil!