Although brass is stronger and more resistant to continual use and abuse than other metals, such as copper or bronze, brass is nevertheless susceptible to corrosion and scratching. Over time, the pedals will begin to show ware. It's perhaps wise to leave the work of stripping, polishing and refinishing the pedals to a piano restoration professional. It's important to avoid using harsh, abrasive cleansers, not only because it can damage the laquered brass finish, but also because drips and smudges can easily damage the piano's wood finish.