Answer 1 (posted by @LabelKing): There is a patent leather cream that is especially used for patent leather--the best is by Esquire. http://www.german-shoerepair.com/00280.html
Answer 2 (posted by The Chickor): If you get scratches in them, guys in the service used to use "brasso" to get them out. It worked very well.
Answer 3 (posted by Nicky V): Pledge Wipes also work great as well.
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