Perhaps
xnview could help?
It has a batch processing tool that you can point to a folder, where it will search it, plus all sub folders for images, then, on the transformations tab, you can add the "Clean Metadata" task, choose what tag blocks to clean (remove) and set it to work.
AcdSee does not display the "XPComment" tag in your booklet-2 file, but xnview does, along with the others. It will do a good job of cleaning all that up, (I tested) but note that
all tags in each specified block will be removed.
That will take care of external image files. As far as your 'saved in files' images go, I think you are going to have to remove and resave the images inside the files.
-marko