hi there
you ideally need to clean down with an alkaline based cleaner, ultrapac renovate as an example.
lots of rags, clean everything down, so that the place is ready for redecoraction.
if it is part of an insurance claim, then the will have an approved contractor lined up to do it, therefore i would visit the client and sell yourself as much as you can, make that client love you, then submit your claim to them asap.
when the insurance company says to them " oh we will send jo bloggs fire damage in " then the clientcan say well i have a quote here from another contractor, if the quote is competititive and the client has the gumption to stand their ground, then you stand a chance of getting the work
good luck
regards
martin