Using 91% IPA, I got the case all cleaned up without maring or scratching any of the plastics. Came out quite well! The front edge where it looks like it was melted does bug me, I'll have to keep my eyes out for display plastics now!
I also have a parts keyboard on the way, which I will use to replace the missing "9" key.
I also have a parts keyboard on the way, which I will use to replace the missing "9" key.