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It’s probably not must rust, just half baked on grease.
Le Creuset tended to enamel the inside with a black enamel even if it looks similar to raw cast iron.Depends on how old it is also.
Le creuset went through a phase where they tefloned their cast iron frying style pans, and it was flakey garbage. You couldn’t easily just strip off all the Teflon to raw cast iron as it was enamelled under the Teflon. -
I'd definitely try and claim it.
The le Creuset will be different from your Lodge stuff, as Lodge cast iron is raw cast iron that has a seasoning coat.
The Le Creuset has a 'satin black' enamel coating on the interior which seals the raw cast iron. You can in theory put it in the dishwasher (though it might not shift the patina).Good news though is with a bit of scrubbing with coarse salt, you should be able to get it back to almost mint condition.
I'd be a bit wary, but you could use a steel scrubber, as the vitreous enamel coating should be harder than the steel.
Isn’t that what it’s supposed to look like if used?
Maybe not being used hot enough to carbonise the drippings.
It’s why I don’t rate griddles, they’re too messy for cleanup. Great for indoor burgers though.