Deleting props in the Hierarchy is easy, yes. Heck, you don't even need the Hierarchy Editor. just select the prop in the Preview window and hit Delete. (Shift-delete if you don't want the Confirm Delete dialog)

But you can only do one at a time, and the OP wants to delete a bunch at once. It's a shame we need to find a script to do this. Hopefully P9 will allow mutliple selection.