Removing hidden printers marks from multiple imported files

Hi All

Just wanted to know if there is an easy way to remove "hidden from view but not from print" printers marks from over a thousand files in CDGSX8. They're all pdfs that I imported all at once in order to try and do it all at once but I need to go through the layers panel, scroll down until I hit object 200 select and delete it for over a thousand files.

It's extremely tedious and I could miss a few and not know which ones I missed.

Please tell me there's something easier.

Thanks.