Hmm . . . Perhaps you could send one of those forwarded emails around to everyone in your office. It's from a chapter in Etiquette, Jr., a book written for young people by Mary E. Clark and Margery C. Quigley in 1939. Let's hope it helps your co-worker realize he is making his office mates absolutely insane.
Grooming Be clean.
Do not start off to work in an untidy suit or dress, with unpolished shoes, untidy nails, unkempt hair, or with evidences of having recently eaten garlic or onions. Always wear fresh underwear, for the same reason. Do not wear party clothes to work, or clothes which are not plain. The desk or counter, or even elevator, is no place to clean your nails, or to comb your hair. Do not eat except during lunch hours, and then only in the place appointed you to eat.