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a) Chisels, acetone and sticky stuff remover (limonene?) for the foam adhesive residue (possibly completely ineffective), hot soapy water, and 1/10 conc hydrochloric. Some stains and residues still there so considering further action
b) Reports are misleading and always lump in open fires, and I've thus far found no conclusive evidence that high efficiency stoves with tertiary air supply for good secondary combustion contribute meaningfully to pollution or health issues.
Not pictured: 12 hours of having my head stuck in a fireplace. The cloud of shite that covered me when the closure board came off is one of the most disgusting things I've ever experienced. Also not pictured: the small fan I bodged into the flue to try and get a draught going so I didn't get too much cancer from the lime/cement/HCl fumes.
Squirrel though
ToBeCont.