Hi guys, this is my first thread on this forum! 
Recently I got my cards from my first psa submission back and it was pretty disappointing to see that even brandnew psa cases does have minor or even major scratches on the psa cases. As the title says, I’m looking for the best way to remove them. Is there a certain plastic polish that works good for you? And is there maybe even a video from a user where he is showing how he does it?
I hope you guys can help. Thanks for reading.
I’ve seen this thread, but I was hoping for some more opinions on this. 
I always use these methods from top to bottom based on their effectiveness.
Toothpaste
White toothpaste is very effective at removing shallow scratches from CDs and DVDs and can remove scratches from other manufactured plastic items. Apply a thin coating of toothpaste with a soft cloth. Gently rub in a circular motion, then rinse clean. This will remove the scratch.
Brass Polish
Brass polish will remove fine scratches from plastic items. Apply a drop of polish on a cotton ball and rub on the plastic. Use a clean cloth to remove any remaining polish; do not rinse.
Baking Soda
Combine equal amounts of water and baking soda to create a paste effective at removing surface scratches from plastic. Use a clean cloth to apply it to the scratches, then buff with the cloth. Rinse and wipe away any remaining baking soda paste. Allow the plastic to dry. Stubborn scratches may require you to repeat this process until the scratches are completely gone.
If you want a more professional way of doing it, and aren’t cheap;) use the Novus system. Just check Amazon for it.
Thank you very much, gary. It’s a pleasure for me that you took a bit of your time to help me. Have a nice day. 
I use Polywatch for light scratches. Others have already mentioned many great ways, you should be set.
Thanks guys. 