http://wiki.ffxiclopedia.org/wiki/Deodorize

Lessens chance of being detected by smell. This is blood aggro, this spell does not stop mobs from CHASING you by scent.I have slept crawlers and leeches and various other things and have run well out of change and casted sneak/invis/deod and the mob kept chasing me. As to the prevent's blood aggro, i was doing an assault and due to horriffic planning by the leader, my drg/whm was the only one alive because i had RR, and the rest of the group had no hope of getting up, all we had to do was get to the lamp. This particular assault has lamia, ghosts and skeles in it, several of which were between me and the exit, yes they all aggro low hp and snk. So i casted deoderize snk/invis and took off, still weakened. My weakened happened to wear off right in the middle of about 4 low hp (blood) aggroing mobs. Due to putting deoderize on, nothing aggroed me and i got to the exit and we won.

Deodorizer
Flask of deodorizer
When applied, this powerful deodorant
neutralizes even the strongest
of odors.

Stackable: 12
Medicine Effects: (Instant, Information Needed)
Deodorize effect

There is your item for it.