1 Corinthians 5:17 says : " Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new."
Humans are horrible, filthy sinners. We can only be made clean through Christ. He can cleanse all unrighteousness from us. 1 John 1:9 : " If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness." He will only do this if we ask Him! He wouldn't cleanse us of our sins, if we didn't repent , and ask Him to.
Being cleansed isn't the last step. You have to live the way Jesus would. Live life the way He would have us to. Quit your nasty habits, and sins. Be a witness to the world!
Ask Jesus to cleanse you , and to present you as as witness to the world!