Just wondering if all of these methods take it to the bare metal?
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Yes, they do, but that's ok. You would just need to season it again like you would with cast iron. Coat with a very thin film of oil then heat it up and get it smoking. When it stops smoking, turn off the heat, let it cool down then put another thin film of oil on and repeat process. Do that a couple of times and you should end up with a nicely seasoned griddle.
BTW, another method of cleaning is to use some oil and a grill brick / pumice stone.