Here is some information directly from the website for
Lodge Cast Iron.
Cleaning your Lodge Cast Iron
After cooking, clean utensil with a stiff nylon brush and hot water. Using soap is not recommended, and harsh detergents should never be used. (Avoid putting a hot utensil into cold water. Thermal shock can occur causing the metal to warp or crack).
TIP: If you are having trouble removing stuck-on food, boil some water in your pan for a few minutes to loosen residue, making it easier to remove.
Towel dry immediately and apply a light coating of oil to the utensil while it is still warm.
TIP: Do not let your cast iron air dry, as this can promote rust.
Store in a cool, dry place. If you have a cover, or lid, for your utensil, place a folded paper towel in between lid and utensil allowing air to circulate. This prevents moisture from collecting inside the utensil, which can cause rust.
TIP: The oven is a great place to store your cast iron; just remember to remove it before turning on the oven.
NEVER wash in dishwasher.
If for some reason your utensil develops a metallic smell or taste, or perhaps rust spots (maybe a well-meaning relative washed your utensil in the dishwasher or with soap thinking they were being helpful), never fear. Simply scour off the rust using a very fine grade of sandpaper or steel wool and refer to our section Re-seasoning Your Lodge Cookware
IMPORTANT PRODUCT NOTE: If you have a Lodge Grid Iron or Pro Grid Iron Griddle, make sure to place it over two burners, allowing the griddle to heat evenly and avoid a stress break or warping. It is also a good to preheat the griddle in the oven before placing over burners on top of stove.
Lodge Cast Iron Cookware - America's Original Cookware - South Pittsburg, TN USA