What is best for removing tarnish from silver trigger guard?

[RailwayMan]

I've tarnish on the silver-plated trigger guards of some Signature Series Colt Blackpowder revolvers.
What is the best way to remove the tarnish?

Can an application of RenWax to the guard after cleaning prevent a re-occurrence?

Thank you.

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[deadeye]

I've tarnish on the silver-plated trigger guards of some Signature Series Colt Blackpowder revolvers.
What is the best way to remove the tarnish?

Can an application of RenWax to the guard after cleaning prevent a re-occurrence?

Thank you.

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