It is not much damaged. I would vacuum it carefully and use light isopropyl alcohol.

I had a Bally Flash Gordon infested by mice one time. They lived there for ages and their urine and feces ruins completely the playfield. They were living on the upper playfield, having made a nest in it. I had no other recourse than to sand the playfield to the wood and glue an overlay. That was before the CPR replicas.

Yves

I have a evel knievel I'm dealong with..I'm using simple green magic erasers and creame gojo.. next is Novus 2 ... seems to be working just fine so far.. no scratching or paint removal.

I had this on my Harlem. 95% of the playfield was fine, but 5% if you rubbed it with a q-tip the paint would fall off. All I can say is, be careful with each spot before you do anything. On mine I could tell a hit by how the might hit it, but.

I've had great results with Gel-Gloss, which I use on 1950s-era Bally games (ink on wood). You can search these forums and find multiple Gel-Gloss hits, but this is a good start:

https://pinside.com/pinball/forum/topic/what-is-the-best-playfield-cleaner#post-3450968

See the final post in the thread.

One concern you read about in topics like this is the balance between dirt removal and abrasion of the surface being cleaned. Gel-Gloss has cleaning power with very little - if any - abrasion to the surface being cleaned. It works on the inks and lacquer equally well on my 1950s games. If you try it, start with a small, inconspicuous area to judge your results.

Just be careful.. test in spots ... I deff had good luck with magic eraser .. simple green .creme gojo with no Grit. Simple green also helps rifle the stink...

And then Novus 2 and millwax

I wouldn't use millwax. Use actual carnauba wax.

And novus 2 only if your trying to remove ball trails. It's an abrasive compound, not a cleaner.

Mask and gloves.