How to clean a very dirty dutch oven: 1/2 – 1 inch of hydrogen peroxide + 1-3 tsp of baking soda, covered. Bring to a boil and simmer for 10-20 minutes. Scrub clean.

Le Creuset
Le Creuset French Oven Bread. I finally make this recipe by Ruhlman! French Oven Bread. I finally make this recipe by Ruhlman! Le Creuset Signature Cast-Iron Dutch Oven, 5 1/2-Qt., White with Gold Knob // Williams Sonoma Le Creuset Stoneware Honey Pot

Revered by both professional chefs and home cooks since its 1925 debut, Le Creuset’s classic French bakeware is prized for its utilitarian good looks and unsurpassed heat retention. As beautiful as it is functional, this line of stoneware bakeware features superior performance in the oven or microwave and is ideal for baked goods and roasted dishes.Le Creuset 8-oz. mini-cocottes. How absolutely adorable! Perfect for French onion soup. :-) Le Creuset 8-oz. mini-cocottes. How absolutely adorable! Perfect for French onion soup. :-) Carribean Collection from Le Creuset! Le Creuset 8-oz. mini-cocottes. How absolutely adorable! Perfect for French onion soup. :-) Revered by both professional chefs and home cooks since its 1925 debut, Le Creuset’s classic French cookware is prized for its utilitarian good looks, unsurpassed heat retention, and lids that create an even “blanket” of heat. Cast iron is clad in smooth, vitrified porcelain (here in kitchen-friendly cherry), rendering each piece impervious to acid, alkali, odors and stains. Non-reactive cooking surface does not require seasoning.

Refer: http://food52.com/hotline/4466-what-s-the-best-way-to-clean-a-very-burned-bottom-of-a-le-creuset-pot