Conscience… For the first time because of Christ and His shed blood the guilt was completely gone, and our conscience could rest easy. This refers to the positional truth because of the cleansing provided by the blood of Christ.
Cleanse… means to make clean by taking away an undesirable part. To cleanse from filth or impurity.
Acts 10.15 (NKJV) And a voice spoke to him again the second time, “What God has cleansed you must not call unholy.”
Heb. 9.15 (NKJV) And for this reason He is the Mediator of the new covenant, by means of death, for the redemption of the transgressions under the first covenant, that those who are called may receive the promise of the eternal inheritance.