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! 
bluorion
Use SprayAway glass cleaner, it is a water based cleaner and will not dissolve the silk-screening on the faceplate. Apply with a toothbrush and wipe off with a cotton towel or diaper. Depending on how dirty it is, you might have to apply and remove several times.