I first hear the term "do over" on the golf course. Don't get the wrong idea, I am not a golfer. However, I need do overs often. I need to start over as if I had never started before. The sin in my life needs to be removed as if it were never there. That is what Jesus provides for us if we will but ask.
Psalm 51:10 (NIV)
10 Create in me a pure heart, O God, and renew a steadfast spirit within me.