refixing the number plate trim

[Draconis]

So I received a rear number plate from CamInHead. I have been trying to clean off the top red garnish bit above the plate holder. I am confused if there's a clear coat on the plastic or not. I dont really have a plentiful supply to use the traditional testing method so if you guys have any tried suggestions on how to clean it up, that would be great. Cheers.