Probably the biggest issue with understanding and using Deodorize is that it doesn't work to evade detection, but rather to remove detection. To use it, you have to break sight/sound long enough to get the effect off (with stun,bind,sleep?) - I think I've been more successful just running over water, but it's not like I've tried very hard to work out the use of Deodorize
More proof that it has even been ignored by the dev.s: there's no other JA/Spell (is there even an item?) that provides the effect - like NIN and DNC, pots, etc.