Quoted from Highclasspinball:Please note there is a different thread with the updated cutout and exactly fitting decals for the wms games and also many more titles.
I guess you can't simply polish it out. I would suggest to fill the scratch with some clear filler. I remember something like that for old cell phone repair. Not sure about the name.
Regards,
Mirco
You should have put a link in like this so people can find it easily.
https://pinside.com/pinball/forum/topic/revised-rad-cals-for-many-more-wms-games