Thanks so much, this was so helpfulTake a look at the link below. This is not a personal recommendation mind, I've never used, or had to use, this approach.
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Lime Mason - Cow Muck
The application of cow manure and lime can help prevent soot staining due to a combination of factors: Physical Barrier: The organic matter in the manure, including hair and fibres, can create a physical barrier that helps to prevent soot particles from penetrating the plaster. Chemical Reaction:www.limemason.com