I do not mean the grates, I mean the whole thing all sections inside and out! After 12 years I finally broke down and cleaned mine! I always burn and brush the grated after every cook. I noticed some flaking from under the lid of the wsm. Also the water pan never seemed to rest on the tabs good without wobbling around. So I took some foil as others have said on here to do and balled it up and scrubbed the inside of the whole thing. Then I used hot water and dish soap on the outside trying not to get soap on the inside. I also used a degreaser on the grates and the outside to get off all the greasy gunk I possibly could. Now I think I am good for another 10 years!