I don't normally keep ammonia on hand, but I always have oven cleaner. I love it for getting polymerized fat off my frypans. As you've discovered, BKF isn't always up to the task. Unless it's raining, there's no need to use a plastic bag. I spray it on and place the pan on the patio overnight. Easy peasy. I also use it on the underside of my heavy aluminum pans.
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