I have an Amnionware (porous glazed inside, cover unglazed) pot. Soaked in water and used it to make a great bean dish. Washed and stored afterwards, alas, with the cover on. Weeks later, I just took it out again to repeat the bean dish, and the inside has lots of black and grey mold, the cover, too. Is it now trash, or does anyone know how I can safely clean this for re-use?