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This one time, at bible camp, (seriously, bible camp) I had to clean out a popcorn popper of all its canola oil residue, as it was filling about a third of the popper, uh, hopper.
Sorry OP, I tried everything. That shit was impossible to remove. At the end we were using wire brushes mounted to a hand drill. The residue would quickly ball up on the wire tips and render them ineffective.
We used every chemical we could get our hands on. Even tried muriatic acid. No luck.
Eventually we threw it out, as the chemicals we used ate holes in the hopper, and yet left the canola residue untouched.