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Short of having a vapor degreaser like some shops, most people use the stuff in the aerosol cans available at most car shops.
Naval jelly, contains phosphoric acid, is supposed to dissolve rust.
Good luck finding a paint that will hold up at cherry red temps. Sounds like ceramic coating time. I've used ordinary high temp paint and a coating of tar inside my tailpipes to protect the metal from condensed water and acid at low spots where it likes to collect, but the temps were nowhere near glowing red.
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