I bought this about 1.5 months ago and have used it 90% of the time for many dishes. Beef roasts come out perfect. Just made pizza in it that was done to perfection. I am trying to find good cleaning instructions as I am not a good after cooking clearer so I have a lot of build up and do not feel that the hot water and soup are going to work. Can you use a standard oven cleaner on the machine with out the bake feature?