Cleaning Stubbornly Stained Cookware in Kitchen Consumer Posted March 5, 2007 The same thing happened to me with my brand new 5 qt. Le Creuset. I walked away and the sauce I was cooking burned solid to the bottom of the pan. Nothing would get it out, including oven cleaner.I called Le Crueuset and asked what next. They told me to boil some water in the pot, then pour a scoopful of Tide (the powder stuff, regular formulation) into it. Boil it for five minutes, then let the water cool to room temp. Scrub with a nylon pad. They mentioned it might take a few tries to get all the black stuff off. With my pot, it took five treatments.For any staining, they said to soak the pot in a solution of bleach and water until the stain was gone.Wash and dry. Then wipe down the inside of the pot with white vinegar.It worked like a charm. The surface is still shiny, although I have noticed it is less nonstick than my other Le Creuset pieces since that unfortunate episode.Good luck!