Cleaning stains from a bean pot?

Scrape out as much as you can, fill with water and let it set overnight. You could put it on the stove and let it simmer over very low heat. Depending on the type of pan, it may have a tendency to burn easier the next time you use it. Just depends on the type. If you manage to get it clean, you may want to season it by putting oil in it and bringing it up to a medium, medium high heat and then letting it cool.