It really doesn't take that long. I can hit the select all per page. Do that on each page and then *poof* they are gone.
They don't have to be done one by one. Not by members either.
Like I said, you need to delete
ALL of them. I can't go through all yoru pages on what you want to keep.
The little arrow

at the top right side of the message box will give you a drop down menu. Just hit select all.
*as a reminder: Don't PM the other Mods unless they post they will do this. You will get me in BIG trouble.