David Kilpatrick wrote:I would use petroleum jelly - vaseline. Very small quantity.
I tend toward silicon grease, far more reliable than petroleum jelly. My favorite for a lot of long term uses is silicon stopcock/high vacuum grease, which does not tend to travel and is immune to just about everything. Also virtually never ages. Apply and spread lightly and then wipe down leaving a almost invisible film.
I do agree with someone else who suggested asking the manufacturer before trying anything. Some modern stuff is pretty delicate.