It is wise to ask to be cleansed from the hidden sins in your heart. God will cleanse us and we will be clean.
Read: Psalm 19:12-13
2 How can I know all the sins lurking in my heart?
Cleanse me from these hidden faults.
13 Keep your servant from deliberate sins!
Don’t let them control me.
Then I will be free of guilt
and innocent of great sin.