Hello,

We use Flitz Polish on brass exteriors.

http://www.flitz.com/

However, polish only solid brass; don’t polish nickel. This resource references soap and warm water or a white vinegar solution for stubborn nickel spots.

https://www.reference.com/home-garden/clean-polished-nickel-3122a8c89b68532f



Todd Lindeblad
Lindeblad Piano Restoration
888.587.4266
todd@lindebladpiano.com
www.lindebladpiano.com