I've had no problem with my cream colored Le Cruset or Mario Batali. Yes, they get a light tan...
color inside, but a gentle Scotch Brite pad cleans most of it off. I cook with red wine, chili, turmeric, etc., and have not had a problem with extreme staining. Of course the outside of the pots stays as pretty as new. I've only had them for about 5 years, and don't use them every day, but Curious1's experience is puzzling. I had a stainless steel stock pot that grew mold under the inside handle rivets, and I boiled water with baking soda in the pot, covering the rivets, and it cleaned up perfectly. Maybe there is something that can be boiled in the porcelain dutch ovens to bleach them?