OCD

This skill acts as a constant and protects from getting dirty against onboard causes only. Diseases, expeditions, or Extracting a Spore can still make you dirty, as they do when wearing the Apron.

Considering loses morale when she is dirty, this skill looks pretty good at first glance. However, Finola cannot complete Researches on her own, and whoever relays her will, unlike her, still need the Apron. As a result, it will probably still remain in the lab, and the skill's main advantage will be to prevent having to drop and pick up the Apron constantly for relays, or to allow Finola to stay clean if she ventures out of the lab to do dirty work (such as eating, or loading fuel after an expedition). It may also be helpful if someone hides, steals or forgets to drop the Apron.

All in all, this skill is only as useful as you make it to be. A Finola who does nothing but research likely will not benefit from taking this in any way.