I've used Mederma to clear up and get rid of my acne scars before and it really worked.
You can also use Lemon to get rid of acne scars since Lemon is a natural bleach and it also helps to lighten any other kinds of scars on your skin.
Another thing that works good for getting rid of Acne Scars on your skin are Apple Cider Vinegar and Aloe Vera.