Thanks for all your replies. We do not live in a bungalow nor has their been a back boiler in the past. I think "Fatarm" got it right in that it's soot contamination. My question is what do I do about it before I decorate the wall?
Having just had the walls re plastered in our 400 year old cottage, the side of the chimney just will not dry. It has dried all around the edge, but in the centre it still looks damp and white salts are starting to come through. The fireplace has a log burner in it which is regularly used. The...
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