^1+... I've got a 12 oz. bottle of food grade mineral oil I bought several years ago for $3.49 at the local pharm, it's like it last s forever...Mineral oil works quite well; no need to wait to get it.
All the above instructions are needed if you want a truly pristine stem, deep shiny black. For most of my pipes a simple rub down with mineral oil restores the stem finish that's smooth enough and black enough for my druthers.
(Then keep it out of bright light!)