Prodry
with regards to tile grout, if you have removed all the greasy soot from grout ,there is grout pens available out there, not sure what the coverage is like or how much
if there is no fire damage to the artex cielings and wall coverings, the decorators will put a seal on them and re-paint accordingly, after the clean, if they can be cleaned without damage
when you do these type of jobs you must make sure all soot deposits are removed,
if and before you use a grout scraping tool make sure tiles are not discontinued because you are likely to crack one or two