I saw a few replies and wanted to add more info.
The stains are unaffected by soap and scrubbing and plastic scrappers and soaking.
The stuff that is on there isn't chunky at all, but some kind of dark film from the chicken and veggies I cooked. And on the flat side there are stains from french toast!
The idea of sandblasting just sounds fun. If it would remove all of the enamel and leave me with a plain cast iron griddle I'd be happy to spend the time with the help of my dad.
When I asked him if he thought it would do the job, he replied "well we can always torch it till the porcelain cracks and then chip away the procelain." :)
Do y'all think I should just ignore the stains?