This is adapted from Psalm 51, a Psalm of David:
Dear Father in Heaven, purge me with cleansing hyssop and I shall be clean; wash me and I shall be whiter than snow in Your eyes.
Cause me dear Lord to hear joy and gladness; hide Your face from my sins and transgressions, and blot out my iniquities, casting them as far as the east is from the west.
Create within me a clean heart, O God, and renew a right and steadfast spirit within me.
Father, do not cast me away from Your presence, and do not take or remove Your Holy Spirit from me.
Restore to me the joy of Your salvation, and hold me up by Your generous and merciful Spirit.
Then I will teach transgressors and sinners Your ways, and they shall be converted to You, by Your Grace and Mercy.
Lord, deliver me from my iniquities and guilt for You alone are the God of my salvation, and then my voice shall sing aloud Your righteousness and glory.
Lord, open my lips, and my mouth shall sing forth Your praise.
I know O God that You do not desire sacrifice, or else I would give it. It is not burnt offerings you desire, but rather O God, the sacrifice You truly desire is a broken spirit, and a broken and contrite heart. These O Lord, You will NOT despise.
Wash me thoroughly from any iniquity and transgressions and cleanse me from my sin and have mercy upon me, O God, according to Your lovingkindness and the multitude of Your tender mercies.
Amen and AMEN!