After 2 yrs of use I found that the edges of my Lodge logic griddle were flaky although the middle was smooth. I used various tools for scrubbing the flaky part but I could not get it out. Researching how to re-season led me to a forum where people suggested the self cleaning oven method. I was skeptical at first but then decided to give it a try. Pretty simple method.
1. Place the griddle upside down in the bottom of the oven and turn the self cleaning cycle. It ran for about 2 hours.
2. Allow to cool. Remember it is going to be really hot.
3. Remove the griddle from the oven. You will notice a lot of dust like stuff fallen below. Now the griddle has been stripped off all seasoning.
First layer of seasoning
4. Remove all dust and clean thoroughly. Apply a thin coating of crisco all over the griddle top and bottom and also the handle. An easy way to apply crisco is to slighty warm the pan up and use a paper towel to rub the crisco.
5. Heat oven to 300F. Place the griddle upside down. After about 30 minutes remove griddle and wipe down any oil dripping. Place it back for another 30 min. First layer down. Let it cool.
Second layer of seasoning
6. Get a second layer by following the same method. Notice the shine. It is still not going to be smooth. Only repeated usage will give that smooth surface.
After 1st use
7. Before using it for cooking I fried onion pieces in lots of oil and threw them away.
8. Griddle is now ready for cooking. The more it is used the more seasoning it gets.