The kind that are accidentally left on a burner for a long time or have burnt food caked on the bottom so bad that normal scrubbing will do no good. And glass baking dishes with baked on layers of grease can be made to be spotless again.
My sis will soak the pans over night in warm soapy water and then scrub with baking soda and lemon juice the next morning.
That’s how she saves pans I ruin.
Yeah, that’s a very good way. I’ve heard of that method. Baking soda mixed with water will also get underarm stains out of t-shirts.