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[Attach] and [Img] in sidebar - how to remove?

You can't. I am using Core XF helpers and Mike, Kier and Chris D have said a million times that they won't remove those. Im not sure if XF2 is any different, but I know that won't change in XF1. Its not something that I am doing, its how XenForo works. Those are placeholders designed to inform the viewing user that there is an IMAGE in that spot.

I don't like it, but nothing I can do about it. Its controlled by XenForo.