Spic N Span

I have a few good casserole dishes that I have used for years. Over time, after years of baking various foods in them, they have become a bit stained. I have tried to remove the stains by normal scrubbing but they are not only ground in, but also baked in. A few weeks ago I was invited to a party and brought along a cooked dish, in one of my casseroles. When it came time to leave, the hostess reminded me to take my baking dish home. When I went into the kitchen to retrieve it, I didn't recognize it. It was spotless. She must have scrubbed it very, very, very vigorously to get the stains out. No matter how hard I had ever tried, they never came out. She must have thought that the stains were fresh and was embarrassed to have me take home a dirty dish. The next time I go there I will bring a different dish until all of my casseroles look like new.