Hello, I recently got some black smudges on my Tivoli pm handles. I wasn't sure what it was so I attempted to wipe it off, but it wouldn't come off. So I did this bonehead move...i licked my finger and tried to wipe it off. But nothing! Now the spots that I wiped are discolored. Is there anything I can do to fix this? It's really not that bad but I can definitely see the color difference. Any advice will be appreciated.