The exit light shows a phenomenon called soot webs. These soot webs form when ionized (i.e. has an electric charge) soot particles stick together in chains. They tend to gather along the edges between your walls and ceiling because those areas tend to be cooler, which smoke likes to move to.
With this fire, and like most most soot damage, we were able to clean the space instead of having to replace structural and content components.
For this project we also used air scrubbers for air quality. They contain HEPA filters and deodorizers.
We made it "Like it never even happened."