A new breakthrough in cleaning technology!

I learned a difficult lesson about a month ago and have spent the past few weeks paying for my mistake. The lesson? Soup can burn. Also, when tomato soup burns, it picks up a vague burned-marshmallow flavor, which just isn't nice. So I kept this pot, which is the nicer of the two that I have, in the sink and over the course of a few weeks I scrubbed at the black crust whenever I washed dishes. Success was minimal and grudging. Finally, growing desperate, one day I noticed a small portion of egg-shell that had somehow made it's way into said pot, and I decided see what would happen if I rubbed it around. Success! Bright, shining, bottom-of-the-pot success! So I then hard-boiled another egg in the same pot and used this new, larger shell as an abrasive. I couldn't believe how well it worked. After so many weeks of trying different methods and lots of elbow grease, who would have thought that all it would take was a little egg shell? I knew eggs had to be good for something!