I purchased a VERY expensive front door about two years ago. It is solid teak and was custom made. (What was I thinking). Well it took six months to get. Door looks great. I am wondering what I can use on it to preserve the finish. I am in Central NJ
So we are subject to heat in summer and cold in winter.

The place where I purchased the door has since gone out of business. My wife recalls that they had mentioned something about a citrus base as a cleaner and preservative. I was in Lowes recently and couldn't find anything. Any suggestions? I'm thinking a paste wax of some sort.