If that does not work use CRC Brakleen in the red spray can. It will work.
Cleaning vintage integrated amplifier
Looking for some advice on cleaning my Denon PMA-757. I finally got it connected to my second system and it sounds fantastic. However, I'd like to clean the silver faceplate a bit. Over the years, it's turned from a champagne/silver color to an antique gold color. Any suggesting of cleaning products to get her shiny again? Thanks so much!