cooktop glass, or porcelain use Bio cleaner paste and a plastic scrub pad. Follow up with a microfiber towel to prevent streaks.
Hi Stephanie: What I use is a paste of vinegar and cream of tartar (the dry stuff). Make a paste and put it on the gunk. Let it sit for about 15 or 20 seconds and then scrape off with a plastic putty knife or one of those plastic scrubbies. You may have to do it a couple of times if the gunk is thick, but usually not. There is no smell and it is environmentally safe. Good luck.
GP66 is a great cleaning solution that should take care of it once you let it sit for a while.
There are lots of ideas here:
This is my go to....works like a charm. https://www.exquisitelyunremarkable.com/2017/04/the-best-way-to-clean-glass-stove-top.html