Brass/Nickle Finishes: Tarnish Cleaning/Prevention

Can someone suggest method and protection for anti-tarnish treatment of (satin) brass and (velvet) nickle finish (bathroom plumbing trim) areas ?
Have read that a non-abrasive polymer-based automoble wax or "Carrubba" should be applied prior to installing new brass. Any suggestions for brands to use/not use ?
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