Grooming Do's and Don'ts
Do wear your hair clean and styled neatly.
Do use deodorant.
Do not use a lot of cologne.
Do not smoke, chew gum or spit tobacco.
Do shave your facial hair.
If you wear a beard, it should be neatly trimmed. Mustaches should also be trimmed.
Do not have dirty fingernails no matter what type of job you are applying for. Trim nails and scrub hands if necessary.
Do cover tattoos wherever possible.Source: http://extension.illinois.edu/dress/05clothes-men-06gr.cfm