How deep are these scratches? I'm no expert but:
If they are light, PlastX should do the job. If deeper, you will have to break out the polisher.
A finishing polish like Meguiar's 205 may be enough. If after one pass, it's not working, step up to something with more cut, like 105.
I am sure Richy or one of the other detailing gurus will chime in soon.