Quoted from Crash:Novus 1 will be more than capable of taking care of surface dirt and dust. For filthy areas a little Novus 2 will help followed by Novus 1 to remove leftover residue. Many swear by Novus 2 alone but this is an abrasive cleaner and people are slowly destroying their playfield when using Novus 2 constantly.
Slowly is the key word here. People have been using it for over 20 years on DP games, and I haven't seen damage yet that could be directly attributed to it.