Welcome to Just Answer..Sorry you are having this problem..In order to clean the stains you will need to completely remove the door from the oven..Then take the door apart..Open the door all the way..You will see small metal tabs at each hinge ..Flip the tabs outward from the oven body towards you..(this will lock the hinges in the out position...Do this for both sides..Then close the door as far as it will let you(should stop at about 5-9 inches from closing completely)..Lift the door off the oven body..Set the door on a towel on a flat surface..Remove the screws along the very bottom of the door and sides..Clean the glass..Then reassemble..The trick here is to remember how each part came off..Taking a picture can help you tremendously..When you are done..Keep the hinges locked outward..Set the door back in the almost closed position..Open the door then move the tabs back into the unlock position..Thanks Bob