Yep. Every several years, a pot of beans is left unattended, sinks up the place and ends up with a rock formation of encrusted bean matter that can't be removed.
This time, it's my dearly-beloved Calphalon One Anodized Infused pot. Sigh.
This method got me to the point where the bottom of the pot is nice and clean. The problem is that there is a ring of burnt-ness starting an inch or so up. It would be very hard to apply the vinegar/baking soda method to the sides of the pot.