ENT played this up quite a bit, with T'Pol's disgust at being near humans and Porthos. Did this all start with two lines from Spock in separate productions?
In TOS: Obsession, he's talking with Garrovick when he senses the cloud creature coming through the air vent. In ST: The Final Frontier (I think it is), Kirk makes an off-hand comment about needing a shower, and Spock sniffs and says "Yes."
In VOY, when Tuvok first meets Neelix, he recommends a bath.
Are there other occurrences?