Novus Scratch Remover For Dome IR Camera

Hi All, for some time I have a good dome IR camera but could not use it since the image is really poor due to scratches on the cover. Finally I ordered NOVUS scratch remover and tested it. I have to say that it did not make any difference. It looks shinier but scratches still remain. So I am wondering does it work only on certain type of plastic also am I use it correctly?

Any thoughts?

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