Mrderrick and Dopogue or correct on using Novus. Novus # 3 is for deep scratches and sometimes not worth the effort. I would go with Novus # 2 and see where it takes you. .5mm is approx. .020 deep ? Number 2 will do that. Novus #1 is a cleaner and helps eliminate static. Does not remove scratches.
Check Dedicated Audio as he stocks both Novus # 1 and Novus #2
Check Dedicated Audio as he stocks both Novus # 1 and Novus #2