Does yours have a clear coat? My understanding is that only very few were done with diamond coat, the majority are with lacquer.

I would advise caution on the non mylard areas of the playfield. On my BoP, I clean it using Novus 2 but it still manages to lift some of the paint here an there, especially the black for some reason. My playfield is somewhat planked though so I think that's why the paint lifts easier than maybe a clean example.

You'd be able to tell if it were Diamond Plate as it's printed on the play field:

http://www.ipdb.org/showpic.pl?id=1502&picno=37054

I use Novus 2 and have never tried anything else so I'm probably not the best person to ask. However like I said, even with Novus 2 I have paint lifting due to mine being (almost not visibly) planked.