I’ve used a razor for really stuck on bits on our glass top stove, but this cleaner also seems to do quite well: https://weiman.com/glass-cooktop-cleaner-polish

For the razor, keep it at a shallow angle (I tend to go around 20 or 30 degrees above the stovetop), and keep a small amount of water on the surface. I usually have a damp rag that I wipe the razor and stovetop with occasionally during the scraping process, to remove the small pieces that come off.

Also, if you are nervous about damaging the stovetop itself, maybe try something only lightly abrasive and warm water, and let the water work it’s magic. (I see you have already tried this, so maybe that isn’t helpful :/ ) From a chemistry perspective, salt water shouldn’t exactly leave behind an insoluble residue, but IDK what else was cooking in the water.

This isn’t due to the blind spot, but it is still pretty weird to experience! Here’s some more info if you are curious: https://en.m.wikipedia.org/wiki/Averted_vision

That’s not as bad as I was expecting, but yeah extra cost is annoying. Thanks for the info about this!

Thanks, I will definitely spend some time looking into those! I saw some information about an additive for the water, and a special cleaning solution you are supposed to use. Do you have to order those regularly to keep it clean and running well?

Could you explain how this humidifier/air purifier works? I’ve wondered about the possibility of an air purifier that uses water rather than a “screen” but haven’t seen anything. My wife and I both have allergies, and our house gets really dry in the winter so one small appliance to deal with both issues sounds like a nice solution.