Believers are told that God's forgiveness is always available - available to cleanse completely:
"If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness," 1 John 1'9.
"And if anyone sins, we have an Advocate with the Father, Jesus Christ the righteous," 1 John 2'1.
There is no sin or act of unrighteousness that can bar a Believer from going to the Father's Throne of Grace for forgiveness in Jesus' name.
Although the devil himself might say otherwise, although he may try to hinder, he does not have the power to block the way.
God's mercy is always available and His grace is sufficient. Confess, repent, ask, and He will forgive.