Mike-soot is basically grease-high alkaline-trisodium phosphate and bleach combo work well.
High alkaline cleaners as well.let the chemicals dwell then rinse and brush-repeat-agitate and rinse.
Here the link to prosoco fireplace cleaner-
What ever you do have the client remove the doors.

On Fri, Mar 23, 2018 at 6:33 PM, Mike Alston <realmikealston@gmail.com> wrote:
Okay thank you Dr. Fred and Joyce. 

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On Mar 23, 2018, at 4:37 PM, Joyce Harris <joyce@thepersonaltouchsolution.com> wrote:

The best, absolute best stone cleaner for soot that we have found is HMK R55 Intensive Cleaner.  It is amazing!
Joyce

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On Mar 23, 2018, at 2:31 PM, Mike Alston <realmikealston@gmail.com> wrote:

Good afternoon pros, will a scrub with good cleaner work to clean off soot off of a stone fireplace?
 
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Regards,
Stu Rosen
201-446-1200