I'm already pretty good at POLISHING metal trim, but is there anything that actually PRESERVES it, so it doesn't get pitted / corroded?
1) Real chrome (like on handles and antennas)
2) Chrome-painted plastic (often used on knobs)
3) Aluminum faceplates (sometimes these have clearcoat over them)
I've had luck using Brasso on #1, because it's made for real metal parts. And it claims to leave a film of silicone over it, to protect it.
For #2 and #3 I usually use a light polish such as Novus. But that just polishes it. Is there anything that would "seal" it?