Kasher frying pan with built up grease

When doing hagalah on a frying pan for pesach, are you allowed to kasher it if there is grease built up around the handle/screws that is hard to clean fully?

first of all a frying pan needs libun not hagalah (since that’s how it was used-on the fire).

Secondly, libun should burn off the gook. Lastly when doing hagalah on a pot with same problem, you may pour bleach on that to make it pagum.

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I thought it was okay to do hagalah on a frying pan for pesach since Chametz is hetera balah?

The pan needs Libun. Since it’s not filled with liquid (as opposed to a pot)