Is Your Cast Iron Seasoned Properly?
If you have an improper seasoning, such as the one in the above image, your food is going to stick. There are no ifs, ands or buts, it WILL stick. It's obvious from the above picture that the person didn't even attempt to season the waffle iron properly. Whatever oil was used was not applied evenly, and was not allowed to "bake" into the iron. It's no wonder this person was unhappy with the waffle iron!
If your cast iron looks like the piece above, you're going to have to completely strip the seasoning and start all over. The easiest way to do that is to place your cast iron in a self-cleaning oven on the cleaning cycle. That will completely strip any seasoning from your cast iron and will return it to it's battleship grey color.
Once you've followed my recommended seasoning instructions, your properly seasoned cast iron should look like this one:
The waffle iron in the last picture went through the seasoning process FOUR times. You'll notice that the seasoning is very even and very shiny. This waffle iron is now completely non-stick and will make the best waffles you've ever had!
There's no "secret" to seasoning your cast iron. It just takes time and a willingness to do it properly. Any cast iron that has been properly seasoned will be completely non-stick and best of all, super easy to clean!