I use Ren Wax on dagger, swords, and firearms used in displays, but have used regular auto wax on working guns. I prefer oil, but on a firearm that may be carried against my clothing, I've used auto wax with good results. I got that tip from a S&W employee probably 20 to 25 years ago. Some auto waxes have polishing compound in them, so you'll want to watch what you buy though.
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