the lid be attach to the cooker , so it be impossible to properly clean ... and the metal of the cooker be porous . I accidentally leave some vegetable in the cooker overnight . a common mistake -- usually easy to clean up after . but because of the porous metal on the inside of the lid , and the fact that it can not be unattached , it be impossible to clean the stench of rotten vegetable out of the lid . everything I make after that taste of it , until I finally have to throw the unit away . again . impossible to clean . you can not let it sit unwashed overnight , not even once . if you do -- forty dollar out the window .