One way to help reduce smoke and soot odors after a fire is to re-smoke the area with a smoke which smells better. This coats the original smoke in the tiny cracks and crevices where the original smoke may have gone.
Doing the procedure requires having everyone and pets, etc., out of the building for several hours and then filling the area up again with the chosen smoke. Application requires the person preforming the re-smoking to wear breathing protection.
After the application and the smoke dissipates/settles, then work can begin cleaning the structure and contents affected by the fire damage.
We usually recommend, and use, a cherry fragrance product. Cherry is one of the fragrances best for use with smoke/fire smells.
Not a fan of cherry? Other fragances are available.