It would help most if you cited which playfield you wanted to clean.

To be fair, there is no one "playfield", and thus there is no one single answer to the question.

Here's how I'd break it down...

1. pre-modern with no clear coat: naptha for sure
2. pre-modern with mylar: 99% (anything is ok, but this is the strongest)
3. modern or CPR with clear coat: novus 2 ???

Do you agree with the 3 grouping and solutions? I'm not a chemist, but that's my feeling on it from listening to people.