In the past, cleaning agents were also natural and therefore non-toxic. Today, instead, we use artificial chemicals, which are becoming increasingly dangerous, toxic, and harmful - especially for nature. And this is exactly the story of the water in which you cooked the beans. Absolutely do not pour it away!
Once you have finished cooking the beans and served them on plates, strain the liquid through a cotton cloth, and this is an excellent cleaner for glass surfaces (it breaks down fats - similar to what happens in our stomach). To use, soak a cloth in this liquid, and for exceptional results, add alcohol vinegar.
Let this be a healthy substitute for chemical cleaners. Chemistry has a strong impact on our lives.
Perhaps even too much!