There's your error. That spray-on stuff sucks. It does not work as advertised.

What you need is the stuff that is largely solid and dry, comes in a jar and which has a sand-like feel to it. Sorry, I don't know the name or brands of that stuff in the US, but it probably exists there as well (the German name of the stuff I use translates to English into something like "cleaning stone"). You take a sponge, put some water on it, rub some of the sand-like substance out of the jar and scrub the junk from the cooktop with that water-sand-solution. The cleaning agent works like sandpaper and is thus much more effective against dried and/or burned-on residue than chemical-only solutions. You only need the razor tool for the really hard cases.

I usually clean my glass cooktop in about 60 seconds this way, and it is actually clean afterwards (ok, maybe add 30 seconds for an additional wipe with glass cleaner to get that pristine "just-installed" look). With the gas ones, even though I love cooking on them when I sometimes find one in a holiday home (because it surely does satisfy that primal urge to tame and use fire), I hate the cleaning, it takes forever because removing the grates and cleaning those takes a few minutes already, and forget about them ever looking like new again. And the cooktop itself also never actually feels "clean" except after a one-hour cleaning marathon because there are so many little edges especially around the burners in which the dirt will inevitably hide during casual cleaning, while the glass one is just a big slab of plain glass, with no place for dirt to hide and accumulate.