Can anyone suggest a way to get this off of my glass cook top?

Ok so I moved into my current home a little over a year ago. The cook top was here when we moved in and it has these horrible stains? I have had glass cook tops before and pride myself on being able to get out or remove any stain, but this refuses to come off and it drives me nuts b/c it's black and always looks like it hasn't been wiped or cleaned. I have tried the following, vinegar, vinegar and baking soda, Comet, lemon juice, lemon juice and baking soda, Windex, bar keepers secret, glass top cleaning paste, WD-40, you name it I've probable tried it. Help!
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