Des
I agree with Lee you will need to know what type of fire, wet smoke, dry smoke, Plastic/rubber, Protein, Fuel and other (the word natural as lee put it needs defining) each has it’s own unique way of cleaning, but if it’s a protein fire don’t waste you time trying to use a lambs wool duster or chemical sponge,
I note that on another forum you posted the same request but only mentioned walls as far as I know smoke is not just limited to walls only but I could be wrong.
Len