I love the New Living Translation of this same verse. "Come now, let's settle this," says the LORD. "Though your sins are like scarlet, I will make them as white as snow. Though they are red like crimson, I will make them as white as wool." God didn't just cover our sins He made them something else, He made them something totally new.
If I make a cake and mix the eggs with the other ingredients you are not going to be able to take those eggs out they are now something completely different. Those eggs no longer exist in their previous form. They don't look like eggs, taste like eggs, because they are not eggs anymore even though they are still in there.
Unlike eggs here in this example and unlike the snow our old nature is not covered up or hidden inside something else we become completely new creatures.
2 Corinthians 5:17 (NLT) "This means that anyone who belongs to Christ has become a new person. The old life is gone; a new life has begun!"
Get to living your new life today. Don't let anyone bring up the old you. That old you doesn't exist if you have been born again. Not born again yet? Then do it right now. Here's how.
Romans 10:9-10 (NKJV) "9 that if you confess with your mouth the Lord Jesus and believe in your heart that God has raised Him from the dead, you will be saved. 10 For with the heart one believes unto righteousness, and with the mouth confession is made unto salvation."
When you say, "Jesus come into my heart. I believe you were born, died and raised again. I need you to come into my heart and save me from my sin. Make me a new creature." He will do just that. Start the new year off with a new you!