You'll have to let that Owner's Manual "air out" for a while. The odor will diminish but never quite go away. The Henry Ford Museum used to maintain a web site for "preservation of archival materials" but i find that's now a dead link. You could try this site at Stanford University, which offers links on variety of archival conservation topics for professionals and the general public.
http://palimpsest.stanford.edu/ One of these sources may offer a remedy for the odor of rodent emissions, but the most likely and surely the least expensive cure is exposure to fresh air--but not sunshine! Don't let it become a cat toy while it's taking the air.
At the larger automotive swap meets one can usually find literature vendors who offer manuals, parts catalogues, sales brochures, paint chips, and other documentation for all makes and models. When you're undertaking a restoration project, these kinds of printed materials can be invaluable.
God's Peace to you.
d
