Improvised steamer = ring at the bottom of stainless steel pot
Searched the cookware thread and couldn't find a similar topic, so looking for some help from your collective wisdom. A visiting relative insisted on making lunch, and used a stainless steel pot (inside also stainless steel) to make a steamer. The assembly was a small glass bowl used as a stand to elevate a large glass bowl. We steamed some stuff for about 2 hours by filling the bottom with water and putting on a lid. Unfortunately, I now have a ring at the bottom of the pot, in same size and shape as the small glass bowl that was touching the pan. I used a paste of baking soda + water immediately, but the stain hasn't budged a bit. It seems to resemble a hard water stain.
Any suggestions? CLR? Steel wool? Thanks for your help.