This is a common result for especially old or especially soiled books. The streaks themselves may contain some ImmacuClean, but usually do not. Typically the
Will grading companies consider the use of Immacuclean to be restoration and give books cleaned with it a special label or note?
This is by far the most common question asked on this site. It wouldn’t be an exaggeration to say it is asked 35-50 times each