Comes off just fine with Easy Off Heavy Duty Oven Cleaner. ;-)
It's not just for ovens.....
While I'd not EVER Consider cleaning my cast iron pan with it
(polymerized oil is what makes it "seasoned"😉, the cast iron lid was
gettig a bit cruddy and since it does not matter if IT is non-stick, I
put it in the sink and sprayed it down, and let it sit for about 2 hours.
Ok, I've been up since about 3 am and went on a cleaning frenzy in the
kitchen between usenet posts. <G> Also did a little cooking. Grilled
some salmon for my housemate for brunch later today and made up some
mixed veggies consisting of sliced bok choy, zuchinni, red onion, straw
mushrooms, button mushrooms and brocolli, all dressed with grape seed
oil, a little braggs liquid aminos, fresh grated ginger, garlic, salt
free lemon pepper, white pepper and some [censored] powder.
After two hours, I took a pot scrubby to the lid and the oven cleaner
had done most of the work. It was no longer black, but a pale silver in
color. Did not mean to clean it THAT well, but I'm sure it'll turn black
again in a few weeks like it's supposed to be. ;-)
At least it's clean.
--
Om.
"My mother never saw the irony in calling me a son-of-a-[censored]." -Jack Nicholson