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Just read this https://www.which.co.uk/reviews/wood-burning-stoves/article/wood-burning-stoves-what-you-need-to-know/stoves-and-pollution
Also read a guardian article who paints a much gloomier picture. Hardly any facts or links to resources, just the usual blah feeding the worry amongst people.
Conclusion is that most pollutants comes from burning wet logs or coal in inefficient stoves. No shit Sherlock. As usual, learn how to do it properly and use the right kit and it’ll be fine.
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.