Pinner says "Ok, I just tried this and it seriously did work. I did it twice on a burner that's had scorch marks for a year or more and they're gone! For anyone as OCD about cleaning as I am, this is a must!
Cleaning with cream of tartar. There are wonderful household cleaners you can make without using lots of chemicals. There are some great sounding ideas, but I havent tried them, so I cannot say if they all work in equal measure. Also, I think you might want to buy in bulk if you were going to use cream of tartar this way.