The plumbing and light fixtures in my main bathroom are polished brass -
quality varies from Moen to Sears to unknown. They've been in place about
15 years.

ALL of them show ugly brown spots under the seal coat, and I'd like to get
them back to shiny new. Any suggestions?

I have really, really, REALLY hard water - could this be a factor in the
pervasive discoloration?

Thanks -