A general term used to describe the removal of
mud, dirt, dust, grease, stains, etc., from the
covers or leaves of a book, map, print, etc.
Cleaning is done in a variety of manners,
depending on the nature of the soiling, the
material soiled, and the facilities available. It
may range from gentle rubbing with bread crumbs to
complete washing and restoration. (173 , 335 )