I've used coffee-soaking to get parts I could only get in white to something more like aged white a few times now with success, but this time I went a little too far. If we're talking Fender colors, it looks more like cream. Any idea how to lighten thing back up again? I'd rather not use anything abrasive (sandpaper, baking soda paste, etc.), and I'm afraid of messing up the color inside the numbers.