venus is a planet whose nature is to be neat and clean. planet in taurus goes a lot for the face value- i.e good representation. saturn is the karaka of filth. if strong venus is impacting the personality can make a person overly careful. virgo is the sign of meticulously keeping things and so do unafflicted mercury. now that cleanliness to a point is required but more than that becomes OCD.. for that agni rashi and greh with rahu can give such tendencies.