I don't think I would suggest turpentine. It tends to get sticky with age. Glycerine sounds better, but nose oil is best.

We used it at EK. Of course, just being a Kodak suggestion might disqualify it to many of you. My first boss had an imposing nose, source of much oil used on negatives at EK. He liberally spread it around when needed. He was head of the Negative, Positive Color Development Lab.