Since Naptha isn’t water-based it’s safer for playfields. You don’t want water to interact with wood. I use Naptha for when there’s noticeable dust and dirt on a playfield.
Think of it like wiping dusty things down with a wet wipe.
Novus is an abrasive cleaner, so use it as such. I personally use Novus 1 and it’s so gentle it almost doesn’t clean anything.
Realistically you aren’t gonna be wiping this game down enough to do damage. Unless you clean it every day or something you should be fine. Normally it’s every 6 to 12 months, or whenever you notice it’s dirty. After you finish the PITA that cleaning a game is, trust me, you will want to wait as long as possible to do it again!