I'm sorry about the fire, my home burned down 4 years ago. PM me if you like, I might be able to give some guidance with insurance dealings. You may have options they are not required to tell you about if you suffered a big loss.
Company we used through insurance to handle salvageable belongings would not touch my guns. However the agent I worked with told me to just clean them with the chemicals I normally would, but a very thorough cleaning. Mine were in a cheap stamped metal safe at the time and did not suffer any heat damage (furthest point from the origin of the fire), so only moderate smoke damage, no water damage.
I deep cleaned everything with Hopps, used aerosol wally world gun cleaner for deeper crevices and wiped down wood with pledge. 4 years later you'd never know anything happened.
Don't let them sit too long, the smoke residue turns to a tar like substance with time. I do not think it is overly corrosive, just a PITA. We owned the burned carnage for another 3.5 years and what metal was in the house did not rust or suffer otherwise from the smoke residue, it just turned very sticky.
Good luck.