A light polishing with Brasso can take quite a few of the light scratches out of SAK scales pretty easily. I guess it's dependant on how the image is put on as to whether polishing would remove it.
Brasso will clean up the scales nicely, but I'm concerned about any screen printing, I can easily see it coming off. For a slightly lighter touch than Brasso I've got a "silver polishing cloth" that works quite nicely to just bring back a bit of the sheen. It's still lightly abrasive though so I'd still be careful around any logos or whatever.
Turned out great. Mike