I would soak the area with vinegar with a paper towel on top. Here is a link to help you out with more options.
http://home.howstuffworks.com/home-improvement/household-hints-tips/cleaning-organizing/5-glass-top-stove-cleaning-tips.htm
I steam clean mine and it is good as new.
How to you steam clean it?
https://www.youtube.com/watch?v=9wHQIfTASDM
Try cheap whit toothpaste.
Make a paste with white vinegar and baking soda applying in a circular motion with a micro-fiber cloth
I use a razor blade and bar keepers friend .and scrub it good bar keeper friend at Walmart [t like comet but no bleach and gentler or soft scrub.
I use a single edge razor blade, and one of those soft green pads, then use stove top polish.
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Won't scrape off, tried vinegar and baking soda, oven cleaner, etc.
I would soak the area with vinegar with a paper towel on top. Here is a link to help you out with more options.
http://home.howstuffworks.com/home-improvement/household-hints-tips/cleaning-organizing/5-glass-top-stove-cleaning-tips.htm
I steam clean mine and it is good as new.
https://www.youtube.com/watch?v=9wHQIfTASDM
Try cheap whit toothpaste.
Make a paste with white vinegar and baking soda applying in a circular motion with a micro-fiber cloth
I use a razor blade and bar keepers friend .and scrub it good bar keeper friend at Walmart [t like comet but no bleach and gentler or soft scrub.
I use a single edge razor blade, and one of those soft green pads, then use stove top polish.